1 Language
                             CLIC\ Command Language Summary

                 Continuum and Line Interferometric Calibration

    INFO            : (HELP CLIC\ INFO) gives a list of recent modifications
    ATMOSPHERE      : Perform atmospheric calibration.
    CHECK           : Check the data for amplitude gain instabilities
    COMPRESS        : Compress data
    COPY            : Copy data
    CURSOR          : Call the interactive graphic cursor
    DROP num [ver]  : Take a scan out of the current index.
    DUMP            : List some informations on the R spectrum.
    FILE type name  : Define the input/output files.
    FIND            : Search the input file for observations.
    GET [N]         : Read a scan in the input file.
    HEADER          : Display some header information on the R spectrum.
    IGNORE list     : Ignore scans from the Input file.
    MARK            : Force data to be treated as if flagged.
    MONITOR         : process calibrations for phase correction parameters.
    LIST [name]     : List header information about an ensemble of scans.
    MASK            : Cause some flags to be ignored.
    MINMAX          : compute extremal amplitudes in data
    MODIFY          : Edit and change the scan header (and data).
    NEW_DATA        : Wait until new data present in input file.
    RESIDUALS       : Plot residuals from last SOLVE operation
    PLOT            : Plot data according to display options
    PRINT           : produces an output text file (PRINT BASELINE).
    SET             : Enter a value for a parameter.
    SOLVE           : Solve for calibration functions.
    STORE           : Store calibration functions.
    TABLE           : Create a UV data Table for mapping purposes.
    TAG qual list   : Change the quality of scans in the output file.
    VARIABLES       : enable/disable CLIC variables
2 INFO
        Main modifications to CLIC since the MAR99 version:
  [24-sep-1999] FIND /RECEIVER is now available
  [24-sep-1999] FIND will not be case sensitive for Source  names  and  Line
    names.

        Main modifications to CLIC since the JUL98 version:
  [29-jan-1999] SET X TCHOP, TCOLD, TCABIN, TDEWAR1, ..., TDEWAR3: Plot some
    temperatures recorded in the receiver cabin.

  [13-jan-1999] SET PHASE ATM /ANT  i  j  :  The  phase  correction  can  be
    validated independently  for the different antennas.

  [24-Nov-1998] SET X GROUNDEMIS, EMISSION, AIRMASS: new items to plot.

  [16-oct-1998] SET SCAN, FIND/SCAN: now accept a more general scan list  s1
    s2 s3 s4 ...

        Main modifications to CLIC since the APR98 version:
  [19-may-1998] MODIFY FOCUS: to correct the phases according to the  actual
    focus
      position used (should be used only on data prior to November 1996,
      or April 1998 for the few projects using HIGH lock).

  [28-apr-1998] SET SELECTION  CONT  /WINDOW  *  is  now  allowed  to  reset
    frequency  windows  in  the  building  of  continuum  tables  from  line
    subbands.

  [28-apr-1998] LIST/SHORT will  now  log  the  scan  numbers  is  an  array
    S_GROUP[2,N_GROUP]

  [25-apr-1998] LIST /OFFSET will give the list of position offsets  in  the
    current index (useful for a mosaic session).

    Main modifications to CLIC since the NOV97 version:
  [16-feb-1998] STORE CORRECTION AUTO [tmin] : tmin is  now  accessible  (in
    minutes)

  [30-jan-1998] SOLVE FLUX now gives the decorrelation  factor  relative  to
    the efficiencies logged in the scan headers.

  [24-nov-1997] SOLVE FIVE [/PLOT] now  possible  for  five  point  pointing
    scans.  SOLVE TOTAL/PRINT available.

    Main modifications to CLIC since the APR97 version:
  [08-oct-1997] FILE /DIRECTORY: Open a window to edit interactively the raw
    data file directories.

  [03-sep-1997] SET AMPLITUDE UNSCALED: to reset the  SET  AMPLITUDE  SCALED
    state (if needed).

  [26-aug-1997]  SET  Y  ATMVALIDITY:  plots  the  validity  of  the   phase
    correction (values 0 or 1) as stored by STORE CORRECTION

  [26-aug-1997] SOLVE GAIN SCAN to solve  gain  scan  by  scan  (instead  of
    averaging all scans)

  [21-aug-1997] SET Y WINDAVERAGE, WINDDIRAV, WINDTOP, WINDDIRTOP: plots the
    wind  variables  (average,  direction  of average, maximum, direction of
    maximum)

  [17-aug-1997] After a FIND the scans are now time ordered even across  the
    9999/0001 scan numbering boundary.

  [17-aug-1997] STORE  CORRECTION  SELF  works  like  AUTO,  but  the  phase
    correction  valitity  is based on the amplitude of each scan, whether or
    not it is a phase calibrator.

  [27-jul-1997] GET n /HEADER to access the  header  vatiables  of  a  given
    observation  without acessing the data itself (i.e. the header file only
    is needed).

  [25-jul-1997] SET OBSERVED n1 n2 : use  integer  representation  of  dates
    made possible

  [22-jul-1997] variable SHORTFILE available after FILE IN  :  contains  the
    file name without directory or extension.

  [04-jun-1997] TABLE /RESAMPLE nchan rchan value  inc  V|F  The  syntax  of
    /RESAMPLE has
     been changed for compatibility  with  CLASS:  One  may  now  enter  the
    velocity or frequency offset at the reference channel.

  [22-may-1997] FILE /WINDOW Open data files  via  a  file  browser  of  the
    windowing system.

  [20-may-1997] SET PHASE ATMOSPHERE NOFILE bypasses  the  effect  of  STORE
    CORRECTION.

  [20-may-1997] It is now HIGHLY RECOMMENDED to  use  the  extension  ".hpb"
    when creating header files for calibration.

  [20-may-1997] FILE RAW [project] [date] [/WINDOW] This command may be used
    to   open   raw  data  files  residing  in  the  directories  IPB_DATA:,
    IPB_DATA1:, IPB_DATA2:, ... assuming they have kept teir original  names
    jj-mmm-yyy-pppp.ipb,  (with date and project name), and to create header
    files for calibration.

        Main modifications to CLIC since the DEC96 version:

  [07-apr-1997] FITS [name] FITS will now create a fits  file  (named  name-
    l0i) with each selected line subband.

  [04-apr-1997] SET SELECTION LINE DSB This is now allowed in LINE mode, and
    means  that  the side band will be automatically selected when the TABLE
    command is issued, to match the desired frequency range.

  [03-mar-1997] SOLVE FLUX [NOREFERENCE] Use the default efficiencies rather
    than a reference source to set the flux scale.

  [03-mar-1997] SOLVE FLUX [BEST n] Average the results of  the  n  antennas
    giving the highest fluxes to compute the source flux.

  [12-feb-1997] COPY HEADERS|DATA [[NO]BASE] [[NO]]ANTENNA 1st  argument  is
    now  mandatory;  second and/or third select which calibration section is
    created.

  [08-jan-1997] STORE CORRECTION GOOD|BAD|AUTO Store, in the header of  each
    scan,  whether the atmospheric phase correction will be applied when SET
    PHASE ATMOSPHERE is used.

        Main modifications to CLIC since the NOV95 version:

  [29-nov-1996] SET WRITE DATA|NODATA now renamed to SET COPY DATA|NODATA.

  [12-nov-1996] STORE QUALITY qual ; change the data quality in the  current
    index (equivalent to a loop of TAG commands).

  [12-nov-1996] LIST /VARIABLE variables /FORMAT formats : lists the  header
    variables for scans in the current index; may also be used with /SHORT.

  [04-nov-1996] SOLVE POINT, SOLVE FOCUS, SOLVE GAIN, SOLVE DELAY  now  have
    an option /PRINT to write an OBS procedure in directory INTEROBS:

  [17-oct-1996] SOLVE HOLOGRAPHY [FREE r1 r2..] : some panel  rings  may  be
    released from the paraboloid fit.

  SET Y AZ_ERR and ELERR ; AZ_PH and  EL_PH  :  plot  pointing  errors,  and
    horizontal coordinates of the phase tracking center.

  [04-jun-1996]
  SET Y AZ_ERR and ELERR ; AZ_PH and  EL_PH  :  plot  pointing  errors,  and
    horizontal coordinates of the phase tracking center.

  [27-may-1996]
  MODIFY  ANTENNA|BASELINE  /OFFSET  89|96  The  argument  to   /OFFSET   is
    mandatory,  and  selects  either  the  old (89) or the new (96) standard
    station coordinates.

  [14-may-1996]
  ATMOSPHERE now checks the efficiencies on phase calibrators, assuming  the
    flux in the header is correct.

  [10-may-1996]
  - FIND /SOURCE s1 s2 .. sn is now supported.  - FIND /SCAN n1 n2 will  now
    loop across 9999/0000 if n1 > n2.

  [29-apr-1996]
  - CLIC is now dimensioned for FIVE antennas.

  [29-apr-1996]
  - SET X|Y PARAL_ANGLE:
     The parallactic angle can be plotted.

  [14-apr-1996]
  - SET COPY DATA|NODATA:
     A new data access mode. See HELP SET COPY.
  - SET BASELINES ALL, SET ANTENNAS ALL:
     Use all the baselines, in the data by default. See HELP SET BASELINES,
  - SET SUBBANDS ALL, SET SUBBANDS LINE, SET SUBBANDS CONT:
     Use all the subbands in the data, switch  between  line  and  continuum
    subbands.
  - SET PHASE EXTERNAL|INTERNAL and STORE PHASE /RECEIVER:
     A new mode to use the other receiver as a  phase  reference  for  phase
    calibration.  See  HELP  SET  PHASE,  HELP  SOLVE PHASE.  See also STORE
    PHASE.

  [07-mar-1996]
  - Command PHASE CONTINUOUS:
     to recover from a real time problem due to jumps of the LO2.

  [07-feb-1996]
  - Command MODIFY AXES:
     to correct for non intersection of the azimut and elevation  axes.  See
    HELP  MODIFY  AXES.  SOLVE  BASELINE has also been modified to solve for
    this parameter using elevation as an X axis.

  [17-jan-1996]
  - Command MODIFY BUG 1:
     to correct for a calibration bug affecting data between 11-nov-1995 and
    09-jan-1996.

  [20-dec-1995]
  - Command  PLOT /NOFRAME pen
     used to overlay a plot with the previous one, using a different color.

  [28-nov-1995]
  - SET PROJECT resets the RF mode to OFF.

        Main modifications to CLIC since the JAN95 version:

  [09-nov-1995]
  - Implementation of the atmospheric correction.
     See command MONITOR, and SET PHASE ATMOSPHERE.

  [08-sep-1995]
  - Command SET SORT RECEIVER|SCAN

  [25-jun-1995]
  - Command SET TIME_ORIGIN

  [08-jun-1995]
  - command SET UV_RANGE:
     data will not be plotted ouside of this range.



1 ATMOSPHERE
        [CLIC\]ATMOSPHERE [DETECTOR|CORRELATOR] [/NOWRITE]

         Recompute the atmospheric (transparency) calibration from the  data
    and  the  informations  provided  by  the  SET  ATMOSPHERE command.  The
    operations are:
      - Compute atmospheric models from calibration scans, using either  the
        continuum  DETECTORs  or  the  continuum  CORRELATOR  to measure the
        atmospheric emission.  The data on the atmospheric monitor (the  1.3
        mm)  receiver  will  also  be  used  to compute the phase correction
        coefficients.
      - Apply the new model to  the  observations  and  write  (update)  the
        recalibrated data if option /NOWRITE is not present.
1 CHECK
        CLIC\CHECK  Threshold  The  continuum  correlator   had   occasional
    instabilities   in   some   of  the    30    subbands.     This  command
    attempts  to  find  out   possible  misfunctions  of  some  subbands  by
    comparing  the  amplitude of a subband to the  mean  amplitude of the 10
    subbands of the same baseline.  Threshold  is  the  detection  threshold
    (expressed  in  standard  deviations   from   mean value).  This command
    process only the current record.

    An example of use is
    VARIABLE DESCRIPTOR ON  ! Turn on Descriptor variables.
    SET TYPE PHASE          ! Use only on continuum sources,
                            !   otherwise no signal...
    FIND
    FOR I 1 TO FOUND
      GET NEXT
      FOR J 1 TO R_NDUMPS   ! Process record by record
        GET/RECORD J
        CHECK 2.0           ! 2 sigma is severe limit. 3.0 is a normal value.
      NEXT
    NEXT
    While these instabilities tend to smear  out   with   time,   a   strong
    misfunction   may   influence   the  result.   Data  should  be  flagged
    accordingly, specially before bandpass calibration.  Checking the source
    data itself is more difficult, since the signal may be too weak.
1 COMPRESS
        CLIC\COMPRESS timemax uvmax

    Compress data in the current index by averaging successive   records  in
    individual   scans.    'timemax'   is   the  maximum  averaging  time in
    seconds.  Data with baseline orientation differing by  more  'uvmax'  in
    meters  in  the  UV  plane  are  not  averaged,  as well as data flagged
    differently.

    Defaults for timemax and  uvmax  are   60   seconds   and   7.5   meters
    respectively.   An  output  file  must  have  been opened to receive the
    compressed data.

    Use command COPY rather than COMPRESS to copy the  whole  current  index
    to a new file.

    For data taken after September 1992 (new correlator), the  command  will
    only   compress   the   temporal   data  (data  header   and   continuum
    subbands), since the spectral data is already compressed to 1 record per
    scan.
1 COPY
        CLIC\COPY HEADERS|[NO]DATA [[NO]BASE] [[NO]ANTENNA]

    Copy contents of the  current  index  to  the  ouput  file.   The  first
    argument  is mandatory and controls whether the data section is actually
    written in the output file.

    COPY DATA selects the old mode which has been used so far.

    COPY HEADERS selects a new mode  in  which  the  data  file,  originally
    written  at  Plateau  de  Bure  is  later only used in a read-only mode.
    Further modifications are written in an output file that  contains  only
    the header sections, with e.g. calibration sections. In that output file
    the data sections are not  written  but  replaced  by  pointers  to  the
    original  file,  which  can  now  reside on a CD-ROM.  When this file is
    later opened for input, CLIC will look for  the  data  sections  in  the
    original  (read-only)  data  file.   The  original data file may be kept
    locally (then it must have one of the  extensions  ".ipb",  ".IPB;1"  or
    ".IPB")  or  reside  in any directory, which is pointed to by one of the
    logical names "IPB_DATA:", "IPB_DATA1:" to "IPB_DATA9:".   The  original
    file  name  MUST  BE  UNCHANGED,  apart from the extension. It is HIGHLY
    RECOMMENDED to use the extension ".hpb" for the new file containing  the
    headers.
    Example:
    Assume the original file is "14-apr-1996-f081.ipb", retrieved from the
    DAT tapes. Create a header file:
    clic\file in 14-apr-1996-f081.ipb
    clic\find
    clic\file out f081-b2.hpb new
    clic\copy headers

    Assume the file was on CDROM. Create a header file:
    sic\log ipb_data: "/CDROM"
    clic\file in "!ipb_data:F404F081.IPB"
    clic\find
    clic\file out f081-b2.hpb new
    clic\copy headers
    !
    ! open f081-b2 for input/output, but do not write the data any more:
    file both f081-b2
    find
    solve phase /plot
    store phase
    ! ...
    and so on as usual, except that the new file "f081-b2.ipb" contains
    only the headers and is much smaller than "14-apr-1996-f081.ipb-data".

    - Most commands are available in  this  new  mode,  even  commands  that
    affect  data  amplitudes  phases  such as ATMOSPHERE, MODIFY BASELINE or
    MODIFY DELAY. The phase factors are kept in the headers and applied only
    when the data will be later read again.

    - There need not be a one to one  correspondence  between  the  original
    ".ipb-data" file contents and the ".ipb" header file. That is the header
    file may refer to only part of the scans in  the  .ipb-data  file  (e.g.
    omit the IFPB or POINT scans), and it may refer to several

    Now arguments [NO]BASE and [NO]ANTENNA control whether respectively  the
    baseline  antenna-based calibration sections are written in the headers.
    Antenna-based cal is now the default  and  omitting  the  baseline-based
    sections  saves  a  lot of space only the antenna-based sections will be
    created; do not forget to use COPY HEADE if you foresee  you  will  need
    baselined-based  calibration; or use COPY HEADERS for not so recent Bure
    data in which the baselined-based  sections  have  been  cre  (otherwise
    those seldom used sections will use half the header space).
1 CURSOR
        CLIC\CURSOR mode

    Call the interactive cursor, if  available  on  your  graphic  terminal.
    This  enables  you  to  measure point coordinates, and perform some data
    editing.  One of the data points is selected according to  the  argument
    `mode'.   In  mode D the closest data point from the cursor is selected;
    in mode X (the default) the data point  with  closest  X  coordinate  is
    selected;  in  mode  Y  the  data  point  with  closest  Y coordinate is
    selected.

      -  Press any key to get the coordinates of the selected point.
      -  Press 'K' to delete the selected point  from   the   current   plot
        buffers (type PLOT SAME to replot the buffers).
      -  Press 'N' to initiate a new range for   Ignore,   Tag,   and   Flag
        (see below)
      -  Press 'I' to ignore all scans in the current  range  (initiated  by
        scans.   This works only with time-like plots,  and  is to  be  used
        preferrably  for  coordinates that are monotonous functions of  time
        (scan number, observation number, time, ...
      -  Press 'T' to tag all scans in the  current  range   (initiated   by
        'N').   This  is  equivalent  to typing the TAG command for the same
        scans.  You will be prompted for a quality in the range   0  to   9.
        Same  comments  as  with  'I'.   The  input and output files must be
        equal.
      - Press 'F' to flag all records in the  current  range  (initiated  by
        affect  the  baseline  or  antenna  corresponding to the box you are
        pointing at.  Same comments as with 'I'.  The input and output files
        must be equal.
      -  Press 'E' to exit the cursor mode.
1 DROP
        CLIC\DROP Obs [Ver]

    Remove an Observation from the current index.  The  version  number must
    be  specified if it is not the last in the input file, even if it is the
    last version in the current index.
1 DUMP
        CLIC\DUMP [Argument]
    A debugging command.

      -  DUMP HEADER argument :  lists a  certain  number  of   informations
        about  the  Observation  header.   Argument  may  be  HEAD, GENERAL,
        POSITION,   INTERFEROMETER,    FREQUENCY,    ATMOSPHERE,    MONITOR,
        CONTINNUM,  LINE,   SCANNING,  IC  (Instrumental  calibration),  AIC
        (Antenna-based   Instrumental   calibration),   PC   (RF    Passband
        calibration),  APC (Antenna-based RF Passband calibration), DD (Data
        Descriptor) ...
      -  DUMP DATA :  lists the data associated parameters.
      -  DUMP FILE :  lists information about the input and output file
      -  DUMP INDEX :  lists information about the current index.
      -  DUMP CONTINUUM :  dumps the continuum data.
      -  DUMP LINE c1 c2 :  dumps the spectral data from channel  c1  to c2.
        DUMP   LINE  c1  c2  /PLOT  will  plot  the  spectral data amplitude
        as a function of channel number.
      -  DUMP VIRTUAL :   gives  the  virtual   memory   and   paging   file
        quotas.
    DUMP DATA, DUMP LINE and DUMP CONTINUUM will give the phase-corrected or
    uncorrected data, depending on the last SET PHASE ATM or SET PHASE NOATM
    command issued.
1 FILE
        CLIC\FILE [Type] [Name] [NEW] [SHARED] [/WINDOW] [/DIRECTORY]

    Selects the input and output files.
    FILE IN name            defines the input file
    FILE OUT name [NEW]     defines the output file ;
                            initializes a file if NEW is precised.
    FILE BOTH name          selects the same file for input and output.
    FILE RAW [proj] [date]  open a raw data file
    The default extension can be specified using command SET EXTENSION (.ipb
    is recommended for files containing data, .hpb for files containing only
    headers).

    If the 'Type' is not RAW, with option /WINDOW (if the  windowing  system
    is  active), a panel window is created and the file name may be selected
    via a file browser ('name' is then used as a filter). Pressing  GO  will
    then open the file.

    FILE RAW [proj] [date] will  select  the  first  file  residing  in  the
    directories   IPB_DATA:,   IPB_DATA1:,  IPB_DATA2:,  ...  following  the
    standard name convention used at Plateau de Bure  (jj-mmm-yyyy-proj.ipb,
    or  YMJJPROJ.IPB for CDROMs), which matches the optionally given project
    name and date. The names of all the NFILE  files  matching  the  project
    name  and  date  are put in character array DATAFILE[NFILE] (the integer
    variable NFILE is also defined).

    With RAW and option /WINDOW (if the windowing system is active), a panel
    window  is created with a menu to select one of the available files, and
    two action buttons, one for opening the file, the other for  creating  a
    header file for calibration.

    With RAW and options /WINDOW and /DIRECTORY (if the windowing system  is
    active), a panel window is created with a menu to edit the list raw data
    file directories (logical names IPB_DATA:, IPB_DATA1:, ...)

    The character variable SHORT_FILE  is  available  after  FILE  IN  :  it
    contains the file name without directory or extension.


    On VAX-VMS, FILE IN Name PATCHED will convert the file to VMS format (if
    it was created under  another operating system).
1 FIND
        CLIC\FIND [Append] [New_Data] [/LINE Lname]
     [/NUMBER n1 n2] [/SCAN s1 s2 [s3 s4 ...]] [/QUALITY q]
     [/TELESCOPE Tname] [/PROCEDURE Proc1 Proc2 ...]
     [/TYPE Type] [/SOURCE s1 s2 ... sn] [/OFFSET o1 o2]

    FIND performs a search in the input file   to   build   a   new   index,
    according  to  selection  criteria  defined  by  the SET command.  These
    criteria may be temporarily modified by the following options :

    /LINE Lname         search by line name
    /NUMBER n1 n2       search for the specified range of observation numbers
    /SCAN s1 s2 [s3 s4] search for the specified range(s) of scan numbers
    /OFFSET a1 a2       search for these offsets
    /PROCEDURE p1  pn   search by procedure name(s)
    /QUALITY q          search for the data of quality better than Q.
    /SOURCE s1 ... sn   search by source name
    /TELESCOPE Tname    search for the specified telescope name
    /TYPE Type          search by source type (OBJECT, PHASE, or BANDPASS)
    /RECEIVER number    search by receiver number
    FIND /SCAN s1 s2 [s3 s4 ..] will loop across the 9999/0001 border if  s1
    (s3)  is  larger than s2 (s4). Using several source names in FIND/SOURCE
    is now supported. Source  name  and  Line  name  matching  is  not  case
    sensitive.

    The current index is ordered by scan number or receiver number depending
    on  the  last command SET SORT. However the scan ordering is done modulo
    9999 (i.e. the time order  is  respected  if  the  9999/0001  transition
    occurs in the current index).

    FIND by default overwrites the current index.  Found observations may be
    appended  to  the  current  index by specifying the argument APPEND ; an
    index compression occurs to avoid duplication of scans in the index.

    FIND does not return an error  if  the   index   is   empty,   but   the
    variable  FOUND  is  set  to  0.   FOUND  is always set to the number of
    observations in the index.

    Argument NEW_DATA can be used to wait until new data is present  in  the
    input   file.   This  possibility  is  intended  for  sites  where  data
    acquisition is done in CLIC format (Plateau de Bure) to use CLIC  as  an
    automated  quick  look  facility.   The  behaviour is similar to that of
    command NEW_DATA, but all  selection  criteria  are  considered  and  no
    switching to a new observation type occurs.
1 FITS
        CLIC\FITS name

    Create for each selected  line  subband,  a  FITS  file  containing  the
    spectral  data.  For autocorrelation data the data from all antennas are
    averaged.  For correlation data, the complex data form all baselines are
    averaged and the real part of the resulting visibility is used. The fits
    file names are e.g.  name-l01.fits,  name-l02.fits,  name-l03.fits  (one
    fits file is created for each subband), if one has specified SET SUBBAND
    l01 l02 l03.
1 FLAG
        CLIC\FLAG f1 f2 ...   /ANTENNA  i1  [...]   [/BASELINE   b1   [...]]
    [/RESET]

    Flag the current record (obtained by GET  /RECORD)  with  flags  f1  ...
    Flags  may  be relative to antennas or baselines.  /ANTENNA or /BASELINE
    must be given, with lists  of  antenna  numbers  or  baseline  names  as
    arguments.

    /ANTENNA ALL will flag all antennas,  /BASELINE  ALL   will   flag   all
    baselines.  These are the default.

    Supported flag names are:
    - C01 to C10 for bad individual continuum correlator subbands
    - L01 to L06 for bad individual spectral correlator subbands
    - DATA for bad data
    - TSYS for too high system temperature (antenna based only)
    - LOCK for out of lock local oscillator (antenna based only)
    - POINTING for poor pointing (antenna based only)
    - SHADOW for antenna being shadowed by another antenna (antenna based
    only)
    - SATURATION for too high total power on a particular antenna.
    Use option /RESET to suppress flags that were accidentally set.

    Give FLAG with no argument (but with options) to list the flags  of  the
    current record.

    Use command UPDATE to write the flagged data to disk.  If more than  one
    record is to be flagged, command STORE FLAG should be preferred.
1 GET
        CLIC\GET [N] [/RECORD r] [/HEADER]

    GET copies R into T, and loads the Observation  number  N  in  R.    The
    current  index  initialized  by FIND is first explored, then, if needed,
    the whole input  file.   If  N  is  absent,  the  previous  (last  read)
    Observation  is  recovered.  If N is FIRST, the first Observation of the
    current index is loaded.  If N is NEXT,  the  next  Observation  in  the
    current index is loaded.

    If option /RECORD is present, only record r is loaded.   Otherwise,  the
    average  record  is  loaded;  it  will  contain  the  phase-corrected or
    uncorrected data depending on the last SET PHASE [ATM]|[NOATM] command.

    If option /HEADER is present, only the scan header  is  read.   No  data
    record  is  accessed. This command does not access the data file if only
    the header file is available.
1 HEADER
        CLIC\HEADER

    Displays some header information  on  current  observation.   The   FULL
    format  is  used,  with  the informations selected in command SET FORMAT
    written.  The lines written contain (in output order, but not all  lines
    are necessarily present)

         1.  General information line :
             Observation number and version
             Scan number
             Procedure name
             Source name and type
             Line name
             Telescope name
             Date of observation
             Date of last reduction

         2.  Interferometer Configuration line :
             Number of antennas
             Station numbers
             Number of baselines

         3.  Position information line
             RA or L :  right ascension or longitude (or azimuth)
             DEC or B :  declination or latitude (or elevation)
             Epoch if equatorial coordinates are used
             Offsets in current units
             Type of coordinate (Eq, Ga, Ho)

         4.  Quality information line :
             Tau:  opacity at zenith
             Tsys:  system temperature (outside atmosphere).
             Number of records
             Time:  total integration time on source (minutes)
             El:  elevation of source

         5.  Spectral information lines :
             N:  number of subbands
             N:  number of channels
             I0:  reference channel (real)
             F0:  rest frequency at reference channel
             Df:  frequency resolution (signed)

         6.  Calibration information line :
             B_ef:  Beam efficiency of telescope
             F_ef:  Forward efficiency of telescope
             G_im:  Gain in image band

         7.  Calibration status line :
             Atmospheric calibration done
             Instrumental calibration done
             Passband calibration done

         8.  Pointing corrections line :

         9.  Atmospheric information lines (2) :
             H2O_:  millimeter of precipitable water vapor
             Pamb:  ambient pressure
             Tamb:  ambient (receiver cabin) temperature
             Tchop:  Chopper temperature
             Tcold:  Cold load temperature
             Tatm:  Atmospheric temperature in the signal band
             Tau:  Zenith opacity in the signal band
             Tatm_I:  Atmospheric temperature in the image band
             Tau_I:  Zenith opacity in the signal band

1 IGNORE
        CLIC\IGNORE List_of_Observations

    This  command  can  be  used  to   declare   the   specified   list   of
    Observations (from the INPUT file) to be ignored in all FIND operations.
    They effectively become invisible to CLIC (except in a LIST IN command),
    until  a  FILE  IN  command  is  typed  again.   The  input  file is not
    physically modified however.  The list of observation may have the  same
    format as the index list of a FOR command.

1 LIST
        CLIC\LIST [Name] [/SHORT] [/BRIEF] [/LONG]  [/FLAG]  [/OUTPUT  File]
    [/PROJECT]   [/SOURCE]   [/VARIABLE   var-list   [/FORMAT  format-list]]
    [/OFFSET]

    List header information about an ensemble of observations.  LIST is used
    for  a  quick  look  to  observation headers, in a more or less detailed
    format.  Name specifies the file to be listed :  IN or OUT ; if Name  is
    not present, the current index is listed.  A medium-sized format is used
    by default.
      /SHORT          : Gives only one line for a set of scans with same
                          parameters; IFPB and CALI are not listed.
                          the first and last scan of each group  are  logged
        in
                          array S_GROUP[2,N_GROUP], N_GROUP is the number of
                          groups.
      /BRIEF          : Brief format (Observation numbers and version
                          numbers)
      /LONG           : Long format (not allowed for the output file)
      /OUTPUT File    : Send the list to a disk file instead of the terminal
      /FLAG           : list data flags for current index.
      /PROJECT        : list the observing projects in the current index.
                          the number of differents offset positions is in
                          variable N_OFFPOS
                          the offsets are in array OFFPOS[2,N_OFFPOS]
      /SOURCE         : list the observed sources in the current index.
                          the number of differents  source  is  in  variable
        N_SOURCE
                          the    source    names    in    character    array
        C_SOURCE[N_SOURCE]
      /OFFSET         : list the observed position offsets for  the  current
        index.
      /VARIABLE varst the content of  the  header  variables  in  the  list.
        These  variables  must  have  been  defined by command VARIABLE.  If
        /FORMAT format_list is also given, each  variable  in  the  list  is
        printed  according  to  the associated format item. The format items
        must match the variable types. With option /SHORT, a line is printed
        only  if  at least one of the variables has changed, and is preceded
        by the corresponding scan number range.
      example:
      LIST /VARIABLE FREQUENCY LFCEN[2] /FORMAT f10.3 f6.3 /SHORT gives  the
        sky rest frequency and the central IF frequency of subband L02, as a
        function of scan numbers. To define these variables: use VARIABLE RF
        and VARIABLE LINE.

    The list will  be  ordered  by  scan  numbers  or  by  receiver  number,
    depending on the command SET SORT [SCAN]|[RECEIVER].
1 MARK
        CLIC\MARK f1 f2 ...  [/ANTENNA i ][/BASELINE ij] [/RESET]

    Set the antenna or baseline mark words.

    To decide whether data should be used, CLIC uses the logical OR  of  the
    data  flag words with the corresponding mark words.  Thus data from some
    subbands may be [temporarily] ignored even if unflagged.  Flags  may  be
    relative   to   antennas   or  baselines.  /ANTENNA or /BASELINE must be
    given, with antenna numbers or baseline  names  as  arguments.   Several
    antennas and baselines may be given simultaneously.  Use /ANTENNA ALL or
    /BASELINE ALL for all antennas or all baselines.

    Flag names f1 f2 ...  are   alphanumeric   codes.    Valid   codes   are
    subband  names  (C01  to C10, L01 to L06), DATA, POINTING, SHADOW, TSYS,
    SATURATION and LOCK.

    Use option /RESET to reset flags that were accidentally set in  the mark
    words.

    MARK with no arguments (just options)   will   list   the   MARK   words
    currently in use.
1 MASK
        CLIC\MASK f1 f2 ...  [/ANTENNA i][/BASELINE ij] [/RESET]

    Set the antenna or baseline mask words

    Data  flagged  will  normally   not   be   processed   by    calibration
    commands.   However  flags  set  in  the corresponding mask word will be
    ignored, causing data to be processed anyway.  Flags may be relative  to
    antennas  or  baselines.   /ANTENNA  or  /BASELINE  must  be given, with
    antenna numbers or baseline names as arguments.

    Flag names f1 f2 ...  are   alphanumeric   codes.    Valid   codes   are
    subband names (C01 to C10, L01 to L04), DATA, POINTING, SHADOW, TSYS and
    LOCK.

    Use option /RESET to reset flags that were accidentally set in  the mask
    words.

    MASK with no arguments (just options)   will   list   the   mask   words
    currently in use.
1 MINMAX
        CLIC\MINMAX

    This command is used to compute extremal amplitudes  in  all  continuum,
    line  data,  USB  and  LSB.  Results are stored in variables C_MAXAMP_U,
    C_MINAMP_U and variables with similar names.  This command may  be  used
    in a MODIFY DATA loop, to search for bad data.
1 MONITOR
        CLIC\MONITOR delta_time

    This command is  used  to  prepare  the  atmospheric  radiometric  phase
    correction.    It   processes  the  calibration  scans  to  compute  the
    correction factors (i.e.  the change of path length for a  given  change
    in  emission  temperature  of  the atmosphere at the atmospheric monitor
    frequency (normally 1.3 mm).

    The scans in the current index  are  grouped  in  intervals  of  maximum
    duration  `delta_time' (in seconds); source changes will also be used to
    separate intervals. In each interval a straight line is  fitted  in  the
    variation  of atmospheric emission as a function of time; this line will
    be  the  reference  value  for  the  atmospheric  correction,  i.e.  the
    correction  at  time  t  is  proportional  to the difference between the
    atmospheric emission at time t and the reference at time t.  This scheme
    is used to avoid contaminating the correction with total power drifts of
    non-atmospheric origin (changes in receiver noise and gain, and  changes
    in ground noise).

    MONITOR 0 will use for each scan the average of the atmospheric emission
    as  the  reference  value.  This will cause the correction to average to
    zero in one scan: the average phase is not changed, only  the  coherence
    is restored leading to an improved amplitude.


1 MODIFY
        CLIC\MODIFY Item [Values...]

    This is a command  to  change   some   parameters   relevant   to   data
    acquisition,  such  as  baseline values, time, position of phase center,
    are equal.
2 BASELINE
        CLIC\MODIFY BASELINE b1 x1 y1 z1 [b2 x2 y2 z2 ...] [/OFFSET 89|96]
        CLIC\MODIFY BASELINE FITTED

    Modify the vector coordinates for baseline b1  to  be:    x1,   y1,   z1
    (meters),  and  the  phases  accordingly.   Keyword FITTED will load the
    baseline coordinates the  most  recenty  found  by  the  SOLVE  BASELINE
    command.

    Use option /OFFSET 96 to  enter  baseline  coordinates  offsets  instead
    (i.e.   offsets  from  the  new  (1996)  standard  antenna  positions in
    STATION.DAT).  For old procedures, referring to the old  (1989)  station
    values, use /OFFSET 89 instead.


    Apply to the current index; an output file  must   be   open   (may   be
    equal to the input file).
2 ANTENNA
        CLIC\MODIFY ANTENNA a1 x1 y1 z1 [a2 x2 y2 z2 ...] [/OFFSET 89|96]
        CLIC\MODIFY ANTENNA FITTED

    Modify the vector coordinates for  antenna  a1   to   be:    x,   y,   z
    (meters),  and  the  phases  accordingly.   Keyword FITTED will load the
    antenna coordinates  the  most  recenty  found  by  the  SOLVE  BASELINE
    command.

    Use option /OFFSET 96 to enter antenna coordinates offsets instead (i.e.
    offsets  from the new (1996) standard antenna positions in STATION.DAT).
    For the old procedures use /OFFSET 89.

    Apply to the current index; an output file  must   be   open   (may   be
    equal to the input file).
2 DELAY
        CLIC\MODIFY DELAY a1 d1  [a2 d2 ...] [/OFFSET]

        Modify the delay for  antenna  a1  to  be:   d1 (nanoseconds),
      and  recompute the  phases  accordingly.

    Use option /OFFSET to enter  delay changes with respect to the  precious
    values.

    Applies to the current index; an output file must  be   open   (may   be
    equal to the input file).
2 FLUX
        CLIC\MODIFY FLUX value

    Modify the flux of the calibrator as stored in the header.  In case  the
    calibrator   is   to   be  used  to calibrate amplitudes, the calibrator
    amplitude will be divided by this  number  before  plotting.   (use  SET
    AMPLITUDE SCALED to do this).

    Apply to the current index; an output file  must   be   open   (may   be
    equal to the input file).
2 FOCUS
        CLIC\MODIFY FOCUS antenna1 value1  antenna2 value2 ...

    Correct the phases for the offsets  in  focus,  introduced  to  optimize
    efficiency.   A1  is  the antenna number, value1 the focus offset in mm,
    and so on.  The phases are normally corrected in  real  time  since  29-
    nov-1996.   Between  29-may-1996  and 29-nov-1996, the focus corrections
    were logged in the data files. Before 29-may-1996 they are only  in  the
    log-obs   files.   However  between  29-nov-1996  and  02-apr-1998,  the
    correction had wrong sign for the few projects using HIGH LOCK.

    So use MODIFY FOCUS with NO arguments for data more recent that  29-nov-
    1996:  this  should  correct the HIGH LOCK problem.  Between 29-may-1996
    and 29-nov-1996, MODIFY FOCUS with  no  arguments  will  use  the  focus
    offsets in the header and apply the corresponding phase offsets.

    For older data you may now search for the focus changes in the log files
    to  apply  the phase corrections before calibration; or use jumps in the
    phase calibration just as you had done before.


    This command applies to the current index; an output file must  be  open
    (may  be equal to the input file).
2 SCALE
        CLIC\MODIFY SCALE amplitude phase

    Multiply all data in the current index by this  (complex)  scale  factor
    (in case of emergency only!).

    Apply to the current index; an output file must be open (may be equal to
    the input file).
2 DOPPLER
        CLIC\MODIFY DOPPLER

    Computes the Doppler velocity correction, in case it was not  taken into
    account  at  the  time of observing.  The LO2 frequency in the header is
    assumed to be the frequency actually used.  A warning   is   issued   if
    the  LO1  frequency in the header is not coherent with the LO2 frequency
    (which means the phase tracking might be in error, since  it  uses  that
    LO1 frequency).

    The frequencies and line names introduced by SET FREQUENCY are  used  to
    define the velocity scales for each subband/sideband.

    A related command is MODIFY OBJECT wich change the type of  observations
    from  PHASE to OBJECT, before computing the Doppler velocity correction,
    as in MODIFY DOPPLER.
2 FREQUENCIES
        CLIC\MODIFY FREQUENCIES

    The frequencies and line names introduced by SET FREQUENCY are  used  to
    re-define  the   velocity scales  for each subband/sideband. By default,
    the frequency and line name entered in OBS for  at  data  aquisition  on
    the Plateau de Bure is used for all sidebands and subbands.
2 OBJECT
        CLIC\MODIFY OBJECT

    This command changes the type of PHASE observations (Phase and  Passband
    calibrations)  to  tho  OBJECT  type, then computes the Doppler velocity
    correction, as for MODIFY DOPPLER.  The LO2 frequency in the  header  is
    assumed  to  be the frequency actually used.  A warning is issued if the
    LO1 frequency in the header is  not  coherent  with  the  LO2  frequency
    (which  means  the  phase tracking might be in error, since it uses that
    LO1 frequency).

    The frequencies and line names introduced by SET FREQUENCY are  used  to
    define the velocity scales for each subband/sideband.

2 POSITION
        CLIC\MODIFY POSITION EQ epoch R.A. Dec.

    Modify the source (phase center)  position.  This  precesses  the  phase
    accordingly.  Note  that this cannot change the antenna pointing center.
    Typical use of this command is to correct positions of inaccurate  phase
    calibrators.

2 TIME
        CLIC\MODIFY TIME DUT1

    Modify the time constant DUT1 (in seconds)  .  For  very  high  accuracy
    astrometry,  DUT1  may  need  to  be  adjusted afterwards to correct for
    irregularities for the earth rotation. The "a priori" estimates  may  be
    wrong.   Another  case  is  the  leap  second,  if  they  are introduced
    asynchronously with the DUT1 constant...

2 REFERENCE
        CLIC\MODIFY REFERENCE UPPER|LOWER r1 r2 r3 r4

    The reference channels in the available line subbands  are   changed  to
    the  new  values.   Use with caution:  this command is actually changing
    the frequency and velocity scale of your data.
2 VELOCITY
        CLIC\MODIFY VELOCITY UPPER|LOWER v1 v2 v3 v4

    The reference velocities in the available line subbands are  changed  to
    the  new  values.   Use with caution:  this command is actually changing
    the frequency and velocity scale of your data.
2 HEADER
        CLIC\MODIFY HEADER procedure

    This is a general command to edit the header  of  the   scans   in   the
    current  index..   CLIC  enters a loop in which all the headers are read
    successively.   For  each  header  the  procedure  'procedure'  (default
    extension  ".CLIC")  is  executed.   This procedure may only contain the
    following commands :  DUMP, HEADER, GO, or any SIC command that acts  on
    variables.

    The command GO [WRITE] must end the procedure.  With GO WRITE,  the scan
    header   will   be   updated;   with   only   GO, the scan header is not
    updated and CLIC loads the next scan header in the current index.  If no
    GO command in excountered in the procedure, the loop is aborted.

    If a PAUSE  command  is  found  in   the   procedure,   the   PAUSE   is
    executed,  but  the  prompt  changes to "MODIFY>".  The same commands as
    above may then be executed from the keyboard; "QUIT ALL" may be used  to
    abort the loop.
2 DATA
        CLIC\MODIFY DATA procedure

    This is a general command to edit the data headers of the scans  in  the
    current   index.  CLIC enters a loop in which all the data header of all
    records of all scans in the current   index   are   read   successively.
    For each record the procedure 'procedure' (default extension ".CLIC") is
    executed.  This procedure may only  contain  the  following  commands  :
    DUMP,  HEADER,  FLAG,  MINMAX,  GO,  or  any  SIC  command  that acts on
    variables.

    The command GO [WRITE] must end the procedure.  With GO WRITE,  the data
    record   will   be   updated;   with   only   GO, the data record is not
    updated and CLIC loads the next record from the current index.  If no GO
    command in excountered in the procedure, the loop is aborted.

    If a PAUSE  command  is  found  in   the   procedure,   the   PAUSE   is
    executed,  but  the  prompt  changes to "MODIFY>".  The same commands as
    above may then be executed from the keyboard; "QUIT ALL" may be used  to
    abort the loop.
2 PHASE_SIGN
        CLIC\MODIFY PHASE_SIGN

    Change the sign of all phases of the data in the  current  index.   This
    command is intended for recovering data taken in a preliminary status of
    the new correlator software.
2 AXES
        CLIC\MODIFY AXES a1 x1 [a2 x2 ...]

    Correct the phases for the offset of the elevation axis with respect  to
    the  azimuth  axis.  This  effect,  if  different for differnt antennas,
    causes a phase offset proportional to frequency and  to  the  cosine  of
    elevation.   a1  is  the  antenna  number, x1 the offset between axes in
    meters.  The actual values should be at most 1 mm, and may  be  measured
    using  the  command SOLVE BASELINE, using SET X ELEVATION in addition to
    Hour angle and declination.

2 BUG
        CLIC\MODIFY BUG number

    This command is reserved for the correction of nasty bugs  in  the  data
    acquisition, and worthwhile.  The number is used for identification.

    Current accepted values:
    - 1 Affecting data taken between 11-nov-1995 and  09-jan-1996.   Bug  in
      RDI  found  by  S.  Guilloteau.  The  continuum  data  was erroneously
      calibrated in the real-time aquisition. As result, the continuum  data
      did  not  agree  with  the average of the spectral data.  For instance
      plotting data with "set sub C02 L02"  as  a  function  of  time  gives
      different  results  for  C02  and  L02.  The  result would affect line
      intensities if, as is usually the case, the amplitude  calibration  is
      done with the continuum subbands.

      Correction:  the  current  index  should   contain   both   atmosphere
      calibrations  and  correlation  data; the data file should be open for
      both input and output.  This command  should  not  affect  data  taken
      before  11-nov-1995 and after 09-jan-1996; be careful for the last day
      since the hour is not checked, and RDI was corrected at 3pm.

1 NEW_DATA
        [CLIC\]NEW_DATA [time] [tries]

    Waits until new data has been written to the input file,  then  makes  a
    new  index from all new data.  The type of observation can be changed by
    this command, but the index will contain only observations of one  type.
    Selection criteria defined by command SET are ignored.

    This command can be used to make  a  quick  look  or  analysis  of  data
    produced by a real time acquisition system.  Caution : only two programs
    should access the input file simultaneously, one for writing  the  other
    for reading.

    The  first  argument  is  the  time  interval  between  two  consecutive
    inspections  of  the  file  index;  the  second is the allowed number of
    unsuccessful attempts to find new data in the file. The defaults are  10
    seconds and 12 tries (two-minute timeout).
1 PLOT
        CLIC\PLOT keyword [/NOFRAME [pen]] [/RECORD list] [/APPEND]
        [/IDENTIFY] [/RESET]

    Plot data according to  options  selected  by  CLIC\SET  command.   PLOT
    will  clear  the  screen  before plotting (the default with PLOT ALL and
    PLOT FIRST), while PLOT /NOFRAME will only plot the data itself, in  the
    same boxes, optionally using a different pen (useful to overlay plots).

    Parameters:
      CLIC\PLOT [ALL] Erases the screen and plots all data  in  the  current
        index (default).
      CLIC\PLOT FIRST Plots data from the first observation in  the  current
        index.
      CLIC\PLOT NEXT Plots data from the next  observation  in  the  current
        index.
      CLIC\PLOT number Plots data from the observation of the  given  number
        (must be in the current index).
      CLIC\PLOT SAME Plots again the last plotted  buffers  (with   possibly
        new options, such as line type, limits, ...).
      CLIC\PLOT /NOFRAME [pen] Do not erase the screen, and  plots  data  in
        the  present  boxes, optionally with a new pen. This may be used for
        comparing data or in conjunction with PLOT /APPEND.
      CLIC\PLOT  /RECORD  list  will  plot  only  some   records   for   the
        observation(s).  "list"  is  of  the format n1 to n2 n3 n4 to n5, as
        with SIC\FOR command.
      CLIC\PLOT /IDENTIFY [COLOUR] will plot a  different  GREG  symbol  for
        each source (if SET PLOT POINT  is currently active). Using optional
        argument COLOUR will produce points differing by colour rather  than
        by symbol shape.
      CLIC\PLOT /RESET Reset the  time  origin  (and,  by  consequence,  the
        time-dependent   amplitude  and  phase  calibration  curves)  before
        plotting.
      CLIC\PLOT /APPEND will not reset the previous buffers  before  reading
        data  and  plotting.   This  may  be used at the Plateau de Bure for
        incrementally plotting new data just after it is written on disk.
1 PRINT
        CLIC\PRINT parameter

    Prepares a procedure for further use.

        CLIC\PRINT BASELINE

    Prepares a procedure to be used in OBS to enter the most recently fitted
    baseline  parameters.  This  procedure also contains (but commented out)
    the CLIC\MODIFY command  to  edit  previous  data  to  the  same  fitted
    baseline parameters.

        CLIC\PRINT DELAY

    Prepares a procedure to be used in OBS to enter the most recently fitted
    delay parameters.

        CLIC\PRINT FLUXES

    Prepares a procedure to be  used  in   CLIC   to   re-enter   the   most
    recently determined source fluxes.
1 RESIDUALS
        CLIC\RESIDUALS Item

    Clear the graphic screen and plot  the   residuals   from   last   SOLVE
    command.  Item can only be "BASELINE" up to now.
1 SAVE
        CLIC\SAVE Name [STILL UNIMPLEMENTED]

    SAVE creates a procedure file of name "Name.clic",  containing  all  the
    current  parameters  of  the  program.  This file may be executed at any
    time using the @ command : just type "@@ name" after the  CLIC>  prompt,
    or  pass  "@  name" as a parameter when invoking CLIC (by typing "CLIC @
    name").  This file is composed of standard CLIC  commands,  and  may  be
    edited with any text editor.
1 SET
        CLIC\SET something [value1 [value2 [...]]]

    This command is used to set a value for  a  CLIC   parameter.    If   no
    value argument is given, the default will be restored.
2 AMPLITUDE
        CLIC\SET AMPLITUDE ABSOLUTE|RELATIVE|SCALED [KELVIN|JANSKY]
        [BASELINE|ANTENNA]

    This command decides which scaling factor is applied  to  the  data  for
    plotting   and  writing  the  final  Table, in subsequent PLOT and TABLE
    commands:

      - ABSOLUTE means  that  the  relative  amplitude  calibration  is  not
        applied;
      -  RELATIVE  means  that  the  relative  amplitude   calibration,   as
        determined with SOLVE AMPLITUDE, and stored with STORE AMPLITUDE, is
        applied;
      - SCALED means that the absolute amplitude is divided  by  the  source
        flux
      - ANTENNA|BASELINE switches between Antenna-based  and  Baseline-based
        amplitude  calibrations.   This  switch  will  be  active  for SOLVE
        AMPLITUDE  (calibration  curve   determination),   STORE   AMPLITUDE
        (calibration  curve  store  operation),  and  SET AMPLITUDE RELATIVE
        (for   application).    Both   baseline-based   and    antenna-based
        calibration  curves  may  be  stored  alongside  in the data header,
        independently of each other.


    SCALED is only used  for  the  command  SOLVE  AMPLITUDE  (this  command
    actually forces SET AMPLITUDE SCALED KELVIN).

    The second keyword indicates if conversion between Janskys  and  Kelvins
    is to be done.  With SET AMPLITUDE ABSOLUTE, the amplitudes are normally
    in Kelvins of  main-beam  brightness  temperature,  so  the  default  is
    KELVIN.   With  SET  AMPLITUDE  RELATIVE, the amplitudes are in Janskys,
    since a calibrator of known flux  has  been  used  for  reference.   The
    default  is  then  JANSKY.   If the default is overridden (SET AMPLITUDE
    ABSOLUTE JANSKY or SET AMPLITUDE RELATIVE  KELVIN),  conversion  factors
    are  taken  from  the  scan  headers; these factors may be determined by
    SOLVE FLUX, and stored by STORE FLUX.
2 ANGLE
        CLIC\SET ANGLE Unit

    Specify the angle unit for offsets.  May be R[adian], D[egree],  M[inute
    of  arc],  S[econd  of arc].  Default is MINUTE.  The ANGLE unit is also
    used to display Continuum drifts.
2 ANTENNAS
        CLIC\SET ANTENNAS [a1 a2 ...]
        CLIC\SET ANTENNAS ALL

    Selects the antennas for which data will be displayed by  command  PLOT.
    Valid  antennas  are  currently  1, 2, and 3.  This command is exclusive
    with commands SET BASELINES and SET TRIANGLES.  Parameters which may  be
    displayed in this antenna-mode are obvious antenna based parameters such
    as cable phase, LO-phase and rate, ...  with SET Y  AMPLITUDE  and  when
    more  than  3 antennas are available in  the data,   antenna   amplitude
    is  computed   by   averaging   all   possible  "triangular  ratios"  of
    baseline  amplitudes.   with  SET  Y PHASE a phase is attributed to each
    antenna  by  setting  the phase  of  antenna  1  to   zero,  and  making
    use of closure relations for other antennas (least square fit).  This is
    useful for fitting  baselines  for   instance   (it   enables   one   to
    determine directly antenna position offsets).

    SET ANTENNA with no other antenna selects  all  antennas  used  for  the
    baselines previously in use.

    SET ANTENNA ALL will select all the antennas available in the first scan
    of  the  current index, for each command accessing the data (e.g. PLOT).
    This is now the default.
2 AVERAGING
        CLIC\SET AVERAGING mode

    Selects averaging  of  data  plotted  (the   data   in   the   file   is
    unaffected).


      1.  NONE :  all data points are plotted
      2.  SCAN :  data is averaged within each scan; on  point  is   plotted
        per scan.
      3.  TIME dt :  data is averaged in  time  intervals   of   length   dt
        (seconds).  Data of consecutive scans is NOT averaged together.
      4.  METHOD VECTOR :  complex  visibilities  are  averaged  as  complex
        numbers.
      5.  METHOD SCALAR : amplitude and phases of visibilities are  averaged
        separately.
    See also SET BINNING for another way of averaging data.
2 ASPECT_RATIO
        CLIC\SET ASPECT_RATIO value [AUTO|EXACT]

    Choose a default aspect ratio  (x_size/y_size)  for  boxes  plotted   by
    command  PLOT.  If several boxes must be plotted (depending on subbands,
    baselines, or side bands selected), the plot page will be partitioned in
    order to:
      i) in AUTO mode:  approach  this  aspect  ratio  for  each  box  while
        filling the whole page ;
      ii) in EXACT mode:  use this aspect ratio for each box  (part  of  the
        plot page will be left blank).
    The default is 2.0 AUTO.
2 ATMOSPHERE
        CLIC\SET ATMOSPHERE argument value [/RECEIVER i]

    Selects the way atmospheric calibration is done by  command  ATMOSPHERE.
    Argument may be FILE, AUTO, TREC, or MANUAL.

      -  In FILE mode the actual mode is taken from  the  data  header,   as
        given in the OBS program.
      - In TREC mode the receiver temperature is assumed known, to  set  the
        scale  of  measured sky temperature and optical depth, and determine
        the system noise temperature.  The  receiver  temperature  is  taken
        from  the  data  header,  as  given  in  OBS.  It may be forced to a
        different value by giving it as second argument 'value', or  by  the
        SET TREC command.
      -  In AUTO mode the water wapor content is  assumed   known;   it   is
        determined  from  the  antennas  in TREC mode, if any, or taken from
        the data header, or forced  to  the  value  given   in   the  second
        argument 'value', or by the SET WATER command.
    These parameters, together with the wheather station data, are  used  to
    compute  the system noise temperature for each antenna.  In MANUAL mode,
    no model atmosphere is used,  but  the  values  of  optical  depths  and
    atmospheric temperatures stored in the data.
2 BANDS
        CLIC\SET BANDS b1 b2 ...

    Selects the sidebands for which data will be displayed by command  PLOT.
    Valid codes are currently "UPPER", "LOWER", "AVERAGE", "DIFFERENCE", and
    "RATIO".  In "AVERAGE", "DIFFERENCE" or  "RATIO"  modes,  the  sidebands
    visibilities are combined after correction for their relative phases, as
    determined  by  the  RF  bandpass  calibration.   If  no   RF   bandpass
    calibration  is  available  (i.e.  stored  with  the data), the relative
    phases are obtained  by  averaging  the  continuum  subbands  (which  is
    useless if no continuum emission is detected).
2 BASELINES
        CLIC\SET BASELINES [b1 b2 ...]
        CLIC\SET BASELINES ALL

    Selects the baselines for which data will be displayed by command  PLOT.
    Valid  codes  are currently "12", "13", "23".  This command is exclusive
    with commands SET ANTENNAS and SET TRIANGLES.

    SET BASELINE with no other antenna selects all baselines connecting  the
    antennas previously in use.

    SET BASELINE ALL will select all the baselines available  in  the  first
    scan  of  the  current  index, for each command accessing the data (e.g.
    PLOT).  This is now the default.
2 BINNING
        CLIC\SET BINNING size position
        CLIC\SET BINNING OFF

    Selects data averaging in bins of the  parameter  in  the  X  coordinate
    array.   Bins  are defined by the size of intervals, and the position of
    one of the intervals (in units of the X coordinate).   SET  BINNING  OFF
    will  turn this mode off.  Note that this averaging in bins occurs AFTER
    the averaging selected by SET AVERAGE (normally use SET AVERAGING NONE).
    SET BINNING is particularly useful for plotting data as a function of UV
    coordinates.

    A command SET X used to change the X units will automatically reset  the
    binning OFF.
2 CLOSURE
        CLIC\SET CLOSURE b1 w1 b2 w2 ...

    Select weights to be used for each  baseline  in   using   the   closure
    relations.    (this  is  done  by  a  least  squares  resolution  of  an
    overdetermined system, in antenna mode).  You  may  wish  to  give  more
    weight to the shorter baselines.  Default weights are equal.
2 CRITERIA
        CLIC\SET CRITERIA /DEFAULT Reset all the search criteria for command
    FIND  to their default values.  All the observations in the file will be
    found.

2 /DEFAULT
        CLIC\SET [CRITERIA|ALL] /DEFAULT

    Select the default values for all  the  parameters,  or  for   selection
    criteria only.
2 DATA
        CLIC\SET DATA np nb

    Extend the size of the plot buffers  to   contain   nb   boxes   of   np
    points each.
2 DEFAULT
        CLIC\SET DEFAULT (or SET /DEFAULT)

    Reset all the SET parameters to their default values.
2 DROP
        CLIC\SET DROP low high

    Give the fraction of the passband to be left out  at  the  low-frequency
    and at the high frequency ends of each spectral correlator subband. This
    is used by further PLOT and TABLE commands.  The default is  5%  of  the
    bandwidth at both ends.
2 ERRORS
        CLIC\SET ERROR NOISE|ATMOSPHERE
        Controls the way the error bars for phase plots  in  time  mode  are
        computed.
      - with NOISE the errors are computed according  to  the  system  noise
        only.
      -  with  ATMOSPHERE  the  rms  phase  fluctuations  as  measured  when
        compressing the data, are included in the error bars.
2 EXTENSION
        CLIC\SET EXTENSION string

    Use 'string' as the default extension  for  the   FILE   command.    The
    default    is    ".ipb".     Other    possible  values  are  ".ipb-raw",
    ".ipb-comp", ".ipb-cal", and ".ipb".
2 FLUX
        CLIC\SET FLUX name value [frequency] [date] [/RESET]

    Enters `value' as the flux of source `name' (in janskys).  The  flux  of
    reference   sources   must   be  entered in CLIC, as an input to command
    SOLVE FLUX.  If the flux of a source is entered by SET FLUX, this source
    will be a reference source for determining the antenna efficiencies, and
    the fluxes of other objects.

    After CLIC\SET FLUX name *, source `name'  will  not  be   a   reference
    source  any  more.   Its  flux may then be re-determined by a subsequent
    SOLVE FLUX command.

    Use command SHOW FLUX to list the fluxes  known  to  the  current   CLIC
    session.

    One may optionally enter a frequency (in GHz) and a date  (jj-mmm-yyyy).
    The  frequencies  and  dates  are checked in that case by STORE FLUX and
    SOLVE FLUX. Matching is within 1 GHz for  frequencies  and  1  week  for
    dates.

    If /RESET is given, all entries with the given source name  are  deleted
    from the flux list. SET FLUX ALL /RESET will empty the flux list.

2 FORMAT
        CLIC\SET FORMAT type

    Set the format of the title   of   observations   plotted.    The   same
    format   is  used  by  the  LIST  command.   The  format  may  be  BRIEF
    (Observation number and version, Source name, Line name, Telescope  name
    and position offsets), LONG or FULL which is similar to the long format,
    but also displays the list of original Scans.   The  default  is  BRIEF.
    FULL format is always used for command HEADER.

    Other  keywords  can  be  specified   to   indicate   which   type    of
    information  should  be  written for the LONG and FULL formats.  This is
    done by command CLIC\SET FORMAT Keyword [ON]  [OFF]  (ON  to  write  the
    information  corresponding  to the specified keyword, OFF to ignore it).
    The keywords are

      -  INTERFEROMETER for the number of antennas, baselines, ..
      -  POSITION  for  position  of  the   source,   offsets,    type    of
        coordinates and Epoch
      -  QUALITY  for  the   Opacity,   System    temperature,    Elevation,
        Integration time.
      -  SPECTRAL  for  the  number   of   subbands,   channels,   reference
        channel, rest frequency, frequency resolution.
      -  CALIBRATION for the beam and forward  efficiencies  and  the   gain
        image ratio.
      -  STATUS  for  the  status   of   different   possible    calibration
        operations.
      -  ATMOSPHERE for the water vapor content, pressure,  temperatures and
        opacities in signal and image bands.
    A line of general information is always written in any case.
2 FREQUENCY
        CLIC\SET FREQUENCY subband sideband name freq
        CLIC\SET FREQUENCY ALL name freq

    Select the line name  and  frequency  to   be   used   to   define   the
    velocity  scale,  in  spectral-mode  plots,  for  the given sub-band and
    sideband.  'subband' may be C for continuum or L01 to L04  for  spectral
    correlator  subbands;  'sideband' must be either USB or LSB; 'name' is a
    (max.  12 character) mnemonic for the line  name;  'freq'  is  the  rest
    frequency  in  MHz.  If the line name is '*', then the default frequency
    entered prior to the observation will be used to  compute  the  velocity
    scale for the corresponding sub-band.

    This information will be used by  all  subsequent  SPECTRUM  and  MODIFY
    DOPPLER commands.

    SET FREQUENCY  ALL  will  fill  in   the   given   frequency   for   all
    subbands.
2 GAIN_IMAGE
        CLIC\SET GAIN_IMAGE value /ANTENNA i Give the value of the  relative
    gain  for  the  receiver  image  side  band,  to  be used by the command
    ATMOSPHERE. Use * instead of the value to force the use of  the  numbers
    stored in the file.
2 GIBBS
        CLIC\SET GIBBS  number

    Give the number of channels to be masked on each  side  of  the  central
    frequency,   for   the   correlator   subbands  which  are  obtained  by
    juxtaposition of both sidebands of a common  (third)  local  oscillator.
    Due  to the Gibbs effect, a few channels are corrupted by a contribution
    of the image sideband of the first local oscillator, which  may  contain
    signal  if  the  source has continuum emission.  This is used by further
    PLOT and TABLE commands. The default is 0, which is  relevant  for  line
    sources with no continuum emission.
2 HOUR_ANGLE
        CLIC\SET HOUR_ANGLE first last

    FIND will select all observations with  hour  angles  in  the  specified
    range (in hours).  Default is * * (no selection by Hour Angle).
2 IC
        CLIC\SET IC status

    FIND  will  select  observations   according   to    the    status    of
    Instrumental  (Phase)  Calibration  (IC).  'status' may be YES to select
    observations  already  calibrated,  NO  to  select  still   uncalibrated
    observations, * to disregard this selection criterion.
2 LEVEL
        CLIC\SET LEVEL number

    Set the threshold severity level  for  messages  to  be  output  on  the
    terminal. A reasonable value is 4.
2 LINE
        CLIC\SET LINE NAME

    FIND will select all observations  according  to  the   specified   line
    name.   Default  is  *.   A  syntax  like  NAM*  can  be  used  to  find
    observations with line names beginning by NAM.
2 MODE
        CLIC\SET MODE type

    Selects which kind of data are displayed.  "type" stands  for   TIME  or
    SPEC.    In   TIME   mode,   the underlying parameter is time, i.e.  two
    time-dependent parameters  are  plotted  one  against  each  other,  for
    instance phase versus time, or amplitude versus hour-angle.  In SPECtral
    mode, the underlying parameter  is  frequency,  for  instance  amplitude
    versus velocity.
2 NUMBER
        CLIC\SET NUMBER n1 n2

    FIND will select all Observations with  numbers  between  n1   and   n2.
    Default is * *.
2 OBSERVED
        CLIC\SET OBSERVED d1 d2

    FIND will select all Observations with observing dates  between  d1  and
    d2.   Default  is  * *. d1 and d2 are normally in explicit form (jj-mmm-
    yyyy) but internal day numbers are also accepted  (i.e.  something  like
    SET OBSERVED DOBS-1 DOBS+1 is possible).
2 OFFSETS
        CLIC\SET OFFSETS o1 o2

    FIND will select all observations with  offsets  between  o1   and   o2.
    Default is * *.
2 PC
        CLIC\SET PC status

    FIND will  select  observations  according   to   the   status   of   RF
    Passband  Calibration  (PC).  'status' may be YES to select observations
    already calibrated, NO to select still uncalibrated observations,  *  to
    disregard this selection criterion.
2 PHASE
        CLIC\SET      PHASE      [ABSOLUTE|RELATIVE]      [ANTENNA|BASELINE]
    [DEGREES|RADIANS]      [JUMPY|CONTINUOUS]      [ATMOSPHERE|NOATMOSPHERE]
    [FILE|NOFILE] [INTERNAL|EXTERNAL]

  CLIC\SET PHASE [ABSOLUTE|RELATIVE]
      This command decides which phase correction is applied  to  the   data
    for  plotting and writing the final Table, in subsequent PLOT and TABLE.
    ABSOLUTE means do not use the phase calibration determined by the  SOLVE
    PHASE command, RELATIVE means apply it.

  CLIC\SET PHASE ANTENNA|BASELINE
      Switch between Antenna-based and  Baseline-based  phase  calibrations.
    This   switch   will  be  active  for  SOLVE  PHASE  (calibration  curve
    determination), STORE PHASE (calibration curve store operation), and SET
    PHASE RELATIVE (for application).  Both baseline-based and antenna-based
    calibration  curves  may  be  stored  alongside  in  the  data   header,
    independently of each other.

  CLIC\SET PHASE [ATMOSPHERE|NOATMOSPHERE]
      Switch ON and OFF the atmospheric phase  correction.  The  atmospheric
    phase  correction  is  based  on  monitoring  the atmosphere water vapor
    emission using the 1.3 mm receivers. The correction  parameters  are  in
    the  atmospheric  monitor  header  section, and are computed by commands
    MONITOR or ATMOSPHERE (this is normally done in real time for data taken
    since  November  1995). However the command MONITOR should still be used
    to precise the reference for the correction (see command MONITOR).  With
    SET  PHASE  ATMOSPHERE  the phase-corrected spectral data, if available,
    will be used.

    Note that the phase correction will  NOT  be  applied  if  it  has  been
    declared  invalid  for  a given scan, using the command STORE CORRECTION
    BAD or AUTO, except  if  SET  PHASE  NOFILE  is  in  effect.  See  these
    commands.

  CLIC\SET PHASE [FILE|NOFILE]
      Turn ON of OFF the effect of the STORE CORRECTION command.

    - If SET PHASE ATMOSPHERE FILE, the information on the validity  of  the
    phase correction declared by STORE CORRECTION BAD or AUTO, will be used,
    and the phase correction will be done only on scans validated  by  STORE
    CORRECTION.

    - If SET PHASE ATMOSPHERE NOFILE, this information will be bypassed, and
    the phase correction will be done for all scans.

  CLIC\SET PHASE [INTERNAL|EXTERNAL]
      Switch between two modes of phase calibration.

    INTERNAL is the standard mode (default).

    In EXTERNAL mode the calibration curve from another receiver may be used
    (as  stored  by  STORE  PHASE  /RECEIVER r). On the top of this a second
    order calibration curve may be determined (using SOLVE PHASE) and stored
    as  usual. This does not erase any INTERNAL calibration curve previously
    stored.

    for example, using receiver 2:

    SET PHASE INTERNAL RELATIVE: use the phase curve determined from rec.  2
    only

    SET PHASE EXTERNAL ABSOLUTE: use the phase curve from  rec  1  only,  as
    stored with STORE PHASE /RECEIVER 1

    SET PHASE EXTERNAL RELATIVE: use the phase curve from rec 2,  determined
    on  top  of  the  phase  curve from receiver 1, by using SOLVE PHASE and
    STORE PHASE with SET PHASE EXTERNAL in effect.

  CLIC\SET PHASE arguments ...
      Selects the way phases are determined.  With  arguments  DEGREES   the
    phases are expressed in degrees of angle, with RADIANS in radians ; with
    argument JUMPY  no  attempt  is  made  to  suppress  2pi  jumps  :   the
    determination  is  always [-pi,pi] ; while with argument "CONTINUOUS n",
    the phase jumps are limited to +/- pi,  that  is  the  phase  is  always
    chosen  in  the  range  [previous-pi,previous+pi]; n being the number of
    points averaged together to estimate the 'previous' phase (default is 1,
    higher values are to be used in noisy cases).
2 PLANET
        CLIC\SET PLANET *|P|S

    [Limited help available] Planet model to be used by SOLVE FLUX

    * = default (elliptical disc)

    P = same with primary beam attenuation

    S filename : use data in file filename

2 PLOT
        CLIC\SET PLOT type

    Selects the way the data are  displayed.   "type"   stands   for   LINE,
    POINTS,  HISTOGRAM, or BARS.  In POINTS type, the current GreG marker is
    used.  In BARS type (valid only for the visibility data), 1-sigma  error
    bars are drawn.
2 PROCEDURE
        CLIC\SET PROCEDURE p

    FIND will select observations done under procedure 'p'.   This  may  be:
    CORRELATION,    AUTOCORR,   ONOFF,   CALIBRATE,   POINTING,   FOCUSSING,
    IF_PASSBAND,  DELAY,  or  GAIN_RATIO.   SET  PROCEDURE  *  will  disable
    procedure as a selection criterion.
2 PROJECT
        CLIC\SET PROJECT n

    FIND will select observations done  fro  Observing  Project  number   n.
    Project  numbers  are  positive  integers.   SET  PROJECT * will disable
    project number as a selection criterion.
2 QUALITY
        CLIC\SET QUALITY q

    FIND will select only observations of  quality  better  than   Q   (i.e.
    less than Q).  When originally written, unless the real time acquisition
    system detected a severe problem, all observations  have  quality  0,  a
    priori  the  best.   The  quality  flag of an observation can be changed
    using the TAG command.  See HELP TAG for the recommended quality scale.
2 RANGE
        CLIC\SET RANGE West East South North

    FIND will select all observations  with   offsets   in   the   specified
    range.  Default is * * * *.
2 RECEIVER
        CLIC\SET RECEIVER number|*

    Use the receiver number as a selection criterion.  The  default  is  SET
    RECEIVER * : observations with both receivers will be selected.

2 RECORD
        CLIC\SET RECORD list

    Will force all further PLOT commands to use only the records as given in
    the  list  (e.g. r1 r2 r3 to r4 by r5 ...). Very seldom needed.  Use SET
    RECORD 1 to 1000000 to reset it.

2 REDUCED
        CLIC\SET REDUCED d1 d2

    FIND will select all observations with reduction dates  between  d1  and
    d2.  Default is * *.
2 REFERENCE
        CLIC\SET REFERENCE antenna_number

    Enter the logical number of the antenna used as reference  for  antenna-
    based  calibrations  (both RF passband and phase calibrations).  Default
    is 1.
2 RF_PASSBAND
        CLIC\SET RF_PASSBAND [ON|OFF] [CHANNEL|FREQUENCY]
            [FILE|MEMORY] [ANTENNA|BASELINE]

      ON|OFF  :   switch  on  or  off  the  application   of   RF   passband
        calibration   curve   in   plotting   the  data.   The  RF  passband
        calibration curve is solved for  by  SOLVE  RF_PASSBAND  and  stored
        with   the   data   by STORE  RF_PASSBAND.  Subsequent PLOT commands
        will  use  or  not  this  curve  according  to  the  status  of  SET
        RF_PASSBAND, which is displayed with  the plot.
      CHANNEL|FREQUENCY :  use  either  the   channel   dependent   passband
        curves  or  the  frequency  dependent  passband curve.  The channel-
        dependent passband  curves  must  be   determined   separately   for
        each    subband  (continuum   and   spectral),  while the frequency-
        dependent passband curve is determined by using SOLVE RF_PASSBAND on
        the  continuum  correlator, and  is  used for both the continuum and
        spectral correlators (this will not work for data taken before  July
        14th 1990).
      MEMORY|FILE :  use either the passband curves   just   determined   by
        SOLVE  RF_PASSBAND,  and  still  [resent  in  the program memory, or
        the passband curves previously stored in the  data  headers  of  the
        input  file by a previous command STORE RF_PASSBAND.
      ANTENNA|BASELINE : Switch between Antenna-based and Baseline-based  RF
        passband  calibrations.  This  switch  will  be  active for SOLVE RF
        (passband determination), STORE RF (passband store  operation),  and
        SET  RF  ON  (for  passband  application).   Both baseline-based and
        antenna-based calibration curves may be stored alongside in the data
        header, independently of each other.
2 SCAN
        CLIC\SET SCAN s1 s2 [s3 s4 ...]

    FIND will select all observations with Scan numbers between s1  and  s2,
    or  s3  and  s4  ....   The  Scan  number,  attributed  by  the  on-line
    acquisition system may be different from the observation number which is
    used by CLIC to refer to the observations.  Default is * *.
2 SELECTION
        CLIC\SET SELECTION mode band subband-range  [FREQ  freqout]  /WINDOW
    fmin fmax [fmin2 fmax2 ...]

    Choose the type of data selection to be done  by  command  TABLE,  which
    creates a UV data Table for mapping software.

    - The first argument 'mode' may be CONTINUUM or LINE, to prepare  single
    channel or multiple channel maps.

    - The second argument is the sideband to be used,  UPPER  or  LOWER,  or
    DSB.   DSB  may be used in conjunction with CONTINUUM: in this case, two
    separate visibility points are written, one for each sideband. DSB  used
    in  conjunction  with  LINE means that the side band will be selected to
    match the desired frequency range (as given in the command TABLE),  thus
    allowing  to  mix  in the same table data from USB and LSB, if different
    frequency setups have been used in different configurations.

    - The third argument is a subband range as for SET SUBBANDS command.  In
    Continuum mode subbands are averaged, in spectral mode they are combined
    to produce a single spectrum.  The syntax is, e.g.
        SET SELECTION n1 TO n3
        to include subbands from n1 to n3; or SET SELECTION n1 TO n3 and n4
        to include subbands from n1 to n3 and subband n4.

    The default is : SET SELECTION CONTINUUM, DSB, L01 TO L06

    Arguments "FREQ freqout" are  used  only  for  CONTINUUM  tables.   They
    define  the  frequency (in MHz) used for mapping purposes.  U and V (for
    each side band in DSB mode) will be scaled to this frequency.   This  is
    intended  to  combine  maps  obtained in continuum at slightly different
    frequencies.  The default for  freqout  will  be  the  actual  observing
    frequency,  or  the frequency used for previous data if data is appended
    to a previously existing table by the TABLE command.

    Option /WINDOW  is  used  to  avoid  spectral  lines  when  producing  a
    continuum  table  from  spectral  correlator  data.  The  first two rest
    frequencies (in MHz) give the first frequency window in which data is to
    be used, the next two give the second frequency window, ... etc.

2 SPECTRUM
        CLIC\SET SPECTRUM ON|OFF

    Switch on or off the automatic processing of data by command  PLOT.   If
    SPECTRUM  is ON, all quasi real time processing that is normally done by
    SPECTRUM command will be done by command PLOT while  reading  the  data.
    Note  that, like in command SPECTRUM the result will depend on the order
    at which the data is read; ideally  the  data  should  be  read  in  the
    natural time order.
2 SOURCE
        CLIC\SET SOURCE name1 name2 ...  namen

    FIND will select all scans according  to  the  specified  source  names.
    Default  is  *.   Syntax  like NAM* can be used to find all observations
    with source name beginning by NAM.
2 SORT
        CLIC\SET SORT RECEIVER|SCAN

    The output of LIST and LIST/SHORT may be sorted  primarily  be  receiver
    number or scan number. Use SET SORT to switch between the two modes.
2 STEP
        CLIC\SET STEP t_step

    Select the time interval parameter to be used by  the  SOLVE  PHASE  and
    SOLVE   AMPLITUDE   command  (time  interval  between knots of the cubic
    spline functions).  Value is in hours (default 3 hours).
2 SUBBANDS
        CLIC\SET SUBBANDS n1 n2 ...  [/WINDOW f1 l1 f2 l2 ...]
        CLIC\SET SUBBANDS ALL
        CLIC\SET SUBBANDS EACH
        CLIC\SET SUBBANDS LINE|CONT

    Selects the subbands for which data  will  be   displayed   by   command
    PLOT.   Valid  codes are continuum subbands numbers (C01, C02, ...  C10)
    or line subbands numbers (conventionnaly named L01, L02, L03, and L04  :
    use  L01  if only one subband is present in the data, L01 and L02 if two
    subbands are present in the data, L01, L02, L03 and L04  if  4  subbands
    are present in the data).  Subbands may be grouped by typing:
        SET SUBBANDS n1 to n2 and n3 n4 ...  where two  quantities  will  be
    plotted,  the first being either the average of actual subbands n1 to n2
    and n3 (in Time Mode),  or  the  concatenation  of  spectral  data  from
    subbands  n1  to  n2 and n3 (in Spectral Mode); the second being subband
    n4.

        the first scan of the current index, for each command accessing  the
    data.  The subband are concatenated (equivalent to e.g. SET SUBBANDS l01
    to l06).

        the first scan of the current index, for each command accessing  the
    data.  The subband are NOT concatenated (equivalent to e.g. SET SUBBANDS
    l01 l02 l03 l04 l05 l06).

        SET  SUBBANDS  LINE|CONT  will  switch   all   subbands   to   their
    line/continuum  counterpart,  e.g.  L01 to L04 will be changed to C01 to
    C04 by SET SUBBBANDS CONT (note that this is also automatically done  by
    switching from spectral mode to time mode).

        Use /WINDOW to give first and last channels to  be  used  for   line
    subbands in TIME mode.  In this case line data will be integrated in the
    given window.  For example
        SET SUBBANDS L01 L02 /WINDOW 1 10 1 10 will plot data from the first
    ten  of  the  first line subband, as a  first quantity,  and  data  from
    the  first  10  channels  of  the  second  line  subband,  as  a  second
    quantity.

    In spectral mode the window limits may be used to restrict the plot to a
    certain range, e.g.
        SET SUBBANDS L01 TO L02 /WINDOW 2 64
        will avoid plotting channels 1 and 61 to  64  of  each  of  the  two
    subbands   L01    and    L02,   since   these   channels   are   usually
    meaningless (these subbands are combined here to a single  spectrum;  in
    the  mode  in  which the spectral correlator is split in two subbands of
    64 channels).  Note:  if  you  want  to  use  both  continuum  and  line
    subbands, in the  same plot  page, you should include dummy arguments in
    the /WINDOW option for the continuum spectra:
        SET SUBBANDS C01 to C10 L01 to L02 /WINDOW 0 0 2 64  (two  arguments
    are needed for each resulting spectrum).
2 TELESCOPE
        CLIC\SET TELESCOPE NAME

    FIND will select all scans  according   to   the   specified   telescope
    name.   Default  is  *.   Syntax  like  NAM*  can  be  used  to find all
    observations with telescope name beginning by NAM.
2 TREC
        CLIC\SET TIME_ORIGIN  *|date

    Specify the time origin  for  the  abscissa  in  time  plots.   This  is
    normally  the  day  for  which  the  first  data is plotted, and time is
    displayed  in  hours  since  that  day.  This  day  is  reset  by  using
    PLOT/RESET.

    SET TIME_ORIGIN date forces the time origin to the specified  day  (e.g.
    23-NOV-1995).

    SET TIME_ORIGIN * reset the default (automatic) behaviour.
2 TREC
        CLIC\SET TREC  value /ANTENNA i

    Give the value of the receiver temperature, to be used  by  the  command
    ATMOSPHERE.  Use  * instead of the value to force the use of the numbers
    stored in the file.
2 TRIANGLE
        CLIC\SET TRIANGLE t1 t2 ...

    Selects the triangle products for which  data  will  be   displayed   by
    command  PLOT.   Valid  triangles  :   currently  only  "123" (for three
    antennas).  This command is exclusive with commands  SET  BASELINES  and
    SET  ANTENNAS.   This  command  will  be  effective only if the triangle
    products  have  been  computed  and  stored  in  the  data  by  commands
    SPECTRUM/TRIANGLE  or  COMPRESS/TRIANGLE.   In  that  case  the triangle
    products will have been averaged by these commands; since the  phase  of
    the  triangle  products  are  closure  quantities,  the amplitude of the
    average should not be affected by atmospheric decorrelation.
2 TYPE
        CLIC\SET TYPE par

    FIND will select observations of specified  type  'par'.   This  may  be
    OBJECT,  PHASE  (CALIBRATOR), or RF_PASSBAND (CALIBRATOR).  Use argument
    "*" to disable selection by Source Type.
2 X
        CLIC\SET X parameter [/LIMITS]

    Choose the parameter to be plotted  along  x-axes   by   command   PLOT.
    Valid parameters are :

    Parameters valid in both TIME mode and SPECTRAL mode:
      AMPLITUDE,   PHASE,   REAL,   or   IMAGINARY:    referring   to    the
        visibility   in   the   subband(s),   sideband(s),   baseline(s) (or
        antenna(s)) selected by SET SUBBANDS, SET BANDS, SET   BASELINES  or
        SET  ANTENNAS  commands.   Only  correlation  scans will be plotted,
        not autocorrelations.

      AUTOCORR.    :    the   autocorrelation   power   measured   in    the
        subband(s),   antenna(s)   selected   by   SET   SUBBANDS,  and  SET
        ANTENNAS commands.  Only  autocorrelation  scans  will  be  plotted,
        (including calibration scans), not correlations.

    Parameters valid in SPECTRAL mode only:

      CHANNEL :  channel number in the correlator (use  ony   this   one  if
        Fourier Transform has not been made).

      VELOCITY :  normally with respect to LSR.

      I_FREQUENCY : the frequency in the second IF (around 350 MHz).

      SKY_FREQUENCY : the sky frequency.   This  should  be  the  line  rest
        frequency if the velocity is correct.

    Parameters valid in TIME mode only:

      U_COORD, V_COORD, RADIUS, ANGLE:  referring  to  cartesian,  or  polar
        coordinates,  in  the  (U,V)  plane,  of the baseline(s) selected by
        command SET BASELINES.

      TIME: universal time (in hours, origin determined by  the  first  plot
        made, may be reset by PLOT /RESET).

      SCAN:  the scan number

      NUMBER:  the observation number.

      RECORD:  the record number (1 to the number of plotted points).

      HOUR_ANGLE

      DECLINATION

      RMS_PHASE:  the r.m.s.  of the  phase  of  the  average  of  the  non-
        flagged   subbands   of   the continuum correlator, in current phase
        units  (degrees  or  radians).   This  r.m.s.   phase   is  computed
        during the data compression.

      RMS_AMPLITUDE:  the r.m.s.  of the amplitude of the  average   of  the
        non-flagged   subbands   of  the  continuum  correlator,  in current
        amplitude units  (kelvins  or  janskys).   This  r.m.s. amplitude is
        computed during the data compression.

      DELAY:  as  specified  for  specified  baseline  (differential,  A1-A2
        for baseline 12), or for the specified antenna(s).

      LO_RATE:   as  specified  for  specified  baseline  (differential,  as
        DELAY), or for the specified antenna(s).

      LO_PHASE:   as  used  for   specified   baseline   (differential,   as
        DELAY), or for the specified antenna(s).

      CABLE_PHASE:  as measured for  specified  baseline  (differential,  as
        DELAY), or for the specified antenna(s).

      GAMME:  the current range (1 or 2) of the cable phasemeter.

      TOTAL_POWER:    the   total   power    measured    for    the    given
        antenna(s), as measured by the connected detectors.

      LAMBDA, BETA, or FOCUS:  the scanning coordinates  for   pointing  and
        focussing  scans  (arc  seconds,  or millimeters), for the specified
        antenna, or the moving antenna if the given  baseline (if  only  one
        is moving).

      AZ_CORR: the azimuth collimation correction in arc seconds.

      EL_CORR: the elevation collimation correction in arc seconds.

      FOC_CORR: the Z focus correction in millimeters.

      T00 ...  T04 : general test parameters (in data headers)

      T10 ...  T14 : test parameters (antenna based) (in data headers)

      TREC:  receiver temperature for the given antenna(s).

      TSYS :   Equivalent  system  temperature  for   the   given   baseline
        (Geometrical   mean  of  Tsys  for  both antennas), or for the given
        antenna(s).

      PAMB, TAMB, HUMIDITY: measured atmospheric parameters.

      WIND_AVERAGE, WIND_DIRAV, WIND_TOP, WIND_DIR_TOP: The wind in m/s  and
        the wind direction in degrees, for 5 min. averages and maxima..

      QUALITY: The observation quality as set with commands TAG or CURSOR.

      AZIMUTH, ELEVATION: Start azimuth and elevation for each scan.

      AZ_ERR, EL_ERR: The tracking errors in arc seconds.

      AZ_PH, EL_PH: The azimuth and elevation for each record (as  used  for
        phase tracking).

      PARAL_ANGLE: Parallactic angle (angle between the  vertical  direction
        and the meridian plane)

      WATER: Water content of atmosphere  (as  set  by  the  programmer,  or
        measured with given antenna).

      ATM_EMISSION: From the output of the atmospheric monitor (normally the
        1.3mm  receiver).  This is the measured radiation temperature of the
        atmosphere,  in  Kelvins  of  Rayleigh-Jeans  equivalent   radiation
        temperature.

      ATM_POWER: This is the output of the atmospheric monitor (normally the
        1.3mm receiver). It is the actual counts that appear on the monitors
        during observations.


      ATM_REFERENCE: The atmospheric emission used as a  reference  for  the
        phase correction. This is computed by the command MONITOR. The phase
        correction will be proportional to the difference between the output
        of the atmospheric monitor and this reference value.

      ATM_PHASE: The computed atmospheric phase correction.

      ATM_UNCORRPH: The phase  uncorrected from atmosphere.

      ATM_CORRPH: The phase  corrected from atmosphere.

      ATM_VALIDITY: 0 or 1 whether the phase correction  has  been  declared
        valid or not.


      CAL_PHASE: The phase instrumental calibration curve.

      CAL_AMPLI: The amplitude instrumental calibration curve.

      AIR_MASS: The number of air masses (1/sin(elev))

      GROUND_EMIS: The ground emission in K (calibrated  total  power,  with
        sky emission subtracted).

      EMISSION:  The total power detected in emission in K (ground + sky)

      TDEWAR1,  TDEWAR2,  TDEWAR3:   The   temperatures   in   the   3-stage
        cryogenerators.

      TCABIN, TCHOP, TCOLD: The temperatures of the receiver cabin,  of  the
        ambient load, and the equivalent temperature of the cold load.

    Default are :  SET Y AMPLITUDE PHASE.

    The /LIMITS option is used to specify fixed limits:

    CLIC\SET X TIME /LIMITS t1 t2 where t1 and t2 are the time limits to  be
    used in this example.  The codes "*" and "=" may be used. "*" means that
    the limits are automatically adjusted to the data,  separately  in  each
    box; "=" means that common limits to all boxes are computed.

    For time-like plots, the defaults are "/LIMITS * *  ".   For  frequency-
    like plots, the defaults are "/LIMITS = =".

2 Y
        CLIC\SET Y parameter [/LIMITS]

    Choose the parameter to be plotted along y-axes by command PLOT.

    The  available  parameters  are  the  same  as  with  SET  X  parameter.
    Parameters valid in both TIME mode and SPECTRAL mode:
      AMPLITUDE,   PHASE,   REAL,   or   IMAGINARY:    referring   to    the
        visibility   in   the   subband(s),   sideband(s),   baseline(s) (or
        antenna(s)) selected by SET SUBBANDS, SET BANDS, SET   BASELINES  or
        SET  ANTENNAS  commands.   Only  correlation  scans will be plotted,
        not autocorrelations.

      AUTOCORR.    :    the   autocorrelation   power   measured   in    the
        subband(s),   antenna(s)   selected   by   SET   SUBBANDS,  and  SET
        ANTENNAS commands.  Only  autocorrelation  scans  will  be  plotted,
        (including calibration scans), not correlations.

    Parameters valid in SPECTRAL mode only:

      CHANNEL :  channel number in the correlator (use  ony   this   one  if
        Fourier Transform has not been made).

      VELOCITY :  normally with respect to LSR.

      I_FREQUENCY : the frequency in the second IF (around 350 MHz).

      SKY_FREQUENCY : the sky frequency.   This  should  be  the  line  rest
        frequency if the velocity is correct.

    Parameters valid in TIME mode only:

      U_COORD, V_COORD, RADIUS, ANGLE:  referring  to  cartesian,  or  polar
        coordinates,  in  the  (U,V)  plane,  of the baseline(s) selected by
        command SET BASELINES.

      TIME: universal time (in hours, origin determined by  the  first  plot
        made, may be reset by PLOT /RESET).

      SCAN:  the scan number

      NUMBER:  the observation number.

      RECORD:  the record number (1 to the number of plotted points).

      HOUR_ANGLE

      DECLINATION

      RMS_PHASE:  the r.m.s.  of the  phase  of  the  average  of  the  non-
        flagged   subbands   of   the continuum correlator, in current phase
        units  (degrees  or  radians).   This  r.m.s.   phase   is  computed
        during the data compression.

      RMS_AMPLITUDE:  the r.m.s.  of the amplitude of the  average   of  the
        non-flagged   subbands   of  the  continuum  correlator,  in current
        amplitude units  (kelvins  or  janskys).   This  r.m.s. amplitude is
        computed during the data compression.

      DELAY:  as  specified  for  specified  baseline  (differential,  A1-A2
        for baseline 12), or for the specified antenna(s).

      LO_RATE:   as  specified  for  specified  baseline  (differential,  as
        DELAY), or for the specified antenna(s).

      LO_PHASE:   as  used  for   specified   baseline   (differential,   as
        DELAY), or for the specified antenna(s).

      CABLE_PHASE:  as measured for  specified  baseline  (differential,  as
        DELAY), or for the specified antenna(s).

      GAMME:  the current range (1 or 2) of the cable phasemeter.

      TOTAL_POWER:    the   total   power    measured    for    the    given
        antenna(s), as measured by the connected detectors.

      LAMBDA, BETA, or FOCUS:  the scanning coordinates  for   pointing  and
        focussing  scans  (arc  seconds,  or millimeters), for the specified
        antenna, or the moving antenna if the given  baseline (if  only  one
        is moving).

      AZ_CORR: the azimuth collimation correction in arc seconds.

      EL_CORR: the elevation collimation correction in arc seconds.

      FOC_CORR: the Z focus correction in millimeters.

      T00 ...  T04 : general test parameters (in data headers)

      T10 ...  T14 : test parameters (antenna based) (in data headers)

      TREC:  receiver temperature for the given antenna(s).

      TSYS :   Equivalent  system  temperature  for   the   given   baseline
        (Geometrical   mean  of  Tsys  for  both antennas), or for the given
        antenna(s).

      PAMB, TAMB, HUMIDITY: measured atmospheric parameters.

      WIND_AVERAGE, WIND_DIRAV, WIND_TOP, WIND_DIR_TOP: The wind in m/s  and
        the wind direction in degrees, for 5 min. averages and maxima..

      QUALITY: The observation quality as set with commands TAG or CURSOR.

      AZIMUTH, ELEVATION: Start azimuth and elevation for each scan.

      AZ_ERR, EL_ERR: The tracking errors in arc seconds.

      AZ_PH, EL_PH: The azimuth and elevation for each record (as  used  for
        phase tracking).

      PARAL_ANGLE: Parallactic angle (angle between the  vertical  direction
        and the meridian plane)

      WATER: Water content of atmosphere  (as  set  by  the  programmer,  or
        measured with given antenna).

      ATM_EMISSION: From the output of the atmospheric monitor (normally the
        1.3mm  receiver).  This is the measured radiation temperature of the
        atmosphere,  in  Kelvins  of  Rayleigh-Jeans  equivalent   radiation
        temperature.

      ATM_POWER: This is the output of the atmospheric monitor (normally the
        1.3mm receiver). It is the actual counts that appear on the monitors
        during observations.


      ATM_REFERENCE: The atmospheric emission used as a  reference  for  the
        phase correction. This is computed by the command MONITOR. The phase
        correction will be proportional to the difference between the output
        of the atmospheric monitor and this reference value.

      ATM_PHASE: The computed atmospheric phase correction.

      ATM_UNCORRPH: The phase  uncorrected from atmosphere.

      ATM_CORRPH: The phase  corrected from atmosphere.

      ATM_VALIDITY: 0 or 1 whether the phase correction  has  been  declared
        valid or not.


      CAL_PHASE: The phase instrumental calibration curve.

      CAL_AMPLI: The amplitude instrumental calibration curve.

      AIR_MASS: The number of air masses (1/sin(elev))

      GROUND_EMIS: The ground emission in K (calibrated  total  power,  with
        sky emission subtracted).

      EMISSION:  The total power detected in emission in K (ground + sky)

      TDEWAR1,  TDEWAR2,  TDEWAR3:   The   temperatures   in   the   3-stage
        cryogenerators.

      TCABIN, TCHOP, TCOLD: The temperatures of the receiver cabin,  of  the
        ambient load, and the equivalent temperature of the cold load.

    Default are :  SET Y AMPLITUDE PHASE.

    The /LIMITS option is used to specify fixed limits:

    CLIC\SET Y AMPLITUDE /LIMITS a1 a2 where a1 and  a2  are  the  amplitude
    limits  to  be used in this example.  The codes "*" and "=" may be used.
    "*" means that the  limits  are  automatically  adjusted  to  the  data,
    separately  in  each  box; "=" means that common limits to all boxes are
    computed.

    Default limits are provided for AMPLITUDE and PHASE only (0 *  -180  180
    if  SET  PHASE  JUMPY  is  effective,  and  0 * * * if SET PHASE DEGREES
    CONTINUOUS ; with corresponding values if SET PHASE RADIANS).

2 WATER
        CLIC\SET WATER  value /ANTENNA i

    Give the value of the water vapor content (in mm), to  be  used  by  the
    command  ATMOSPHERE.  Use * instead of the value to force the use of the
    numbers stored in the file.

2 WEIGHTS
        CLIC\SET WEIGHTS [TSYS ON|OFF] [CALIBRATION ON|OFF]

    Selects the way the data is weighted in command TABLE.

    With TSYS ON, data is weighted by   1/TSYS**2,   where   TSYS   is   the
    equivalent   system   temperature   (the   geometrical  mean  of  system
    temperature of both antennas, for a given baseline).

    With TSYS OFF, this weight factor is turned off.

    With CALIBRATION ON, data is also weighted by 1/CAL**2,  where   CAL  is
    the   amplitude   instrumental   calibration   factor  (if  any).  If no
    amplitude  instrumental  calibration  function  is   applied   (absolute
    amplitude), this weighting should have no effect.

    With  CALIBRATION  OFF,  weights   are   not   affected   by   amplitude
    instrumental calibration.

    With  both  TSYS  OFF  and   CALIBRATION   OFF,   data    is    weighted
    proportionally  to  observing  time.

2 COPY
        CLIC\SET COPY DATA|NODATA

    This command is used to select the default  data  access  mode  on  COPY
    commands.

    See the help for COPY.

1 SHOW
        CLIC\SHOW Arg

    Display some parameter defined by SET.   "SHOW  ALL"  will  display  all
    parameters  specified  by  SET  (See SET command).  "SHOW CRITERIA" will
    display only selection criteria,  "SHOW  DISPLAY"  will  give  only  the
    parameters  relevant  to  command PLOT, and "SHOW GENERAL" will give the
    rest of the parameters.
1 SOLVE
        CLIC\SOLVE Item

    This is a  command   to   determine   interferometer   parameters   from
    measured data.  such as baseline values, or calibration curves.
2 AMPLITUDE
        CLIC\SOLVE  AMPLITUDE   [/PLOT]   [/BREAK   ...]    [/POLYNOMIAL...]
    [/WEIGHT]

    This will fit a mathematical function into the  measured   amplitude  of
    the  sources  in  the current index (presumably calibrators).  This data
    must have been selected and plotted in axes :  SET  X  TIME  and  SET  Y
    AMPLITUDE  for  the  baselines  and  bands of interest, specified by the
    corresponding SET commands.  The calibration function is kept in memory.
    Command  STORE  should be used next to store this function in the header
    of source observations, after a  change  in  the  index  to  select  the
    appropriate scans.

    In antenna mode the averaged phase and amplitude closures are  computed,
    as well as their standard deviations. The phase closures should be close
    to zero, while the amplitude closures should be close  to  100%.  Strong
    deviations  of  amplitude  closures  from  100%  are  an  indication  of
    amplitude loss on long baselines, due to phase decorrelation during  the
    time  averaging.  The  fit  then shows strong systematic errors; if this
    occurs, baseline based calibration of the amplitudes might be preferred.

    Option /PLOT will plot the fitted curve over the data.

    Fitted curves may be of two kinds:

  -  Cubic splines (the default).  By default  knots  are  regularly  spaced
    with   an   interval   between   knots   set  by  the  SET STEP command.
    Additional knots may be introduced with the  option:  /BREAK  kind  time
    [kind  time  ...]  a  break introduced at abscissa 'time' ; 'kind' is an
    integer in the  range 0-3; 0 means that a discontinuity will be present,
    1  that  the  first  derivative  will  be   discontinuous,  and  so  on.
    Several  breaks  may  be introduced; the program will detect an error if
    too   many   breaks  are  introduced,  compared  to  the density of data
    points.

  -  Polynomial curves may  be  used  instead.   For  this  the  option  is:
    /POLYNOMIAL  [degree]  indicating  the degree of the polynomial (default
    0).


    Normally the data points are all assigned the same weight  for  the fit.
    With   option  /WEIGHT,  the data points are weighted according to their
    errors.   Errors  are  set   to   the   statistical   errors   for   the
    amplitudes.
2 HOLOGRAPHY
        CLIC\SOLVE HOLOGRAPHY [MO nmodes] [NP npix] [IT niter gain] [FREE r1
    r2  ...]  [/OFFSET  x  y  z] [/PLOT [AMP amin amax astep] [PHA pmin pmax
    pstep] [ERRORS emin emax estep] [NUMBER]

    (Keywords like MO, NP, IT, FREE
     may be given in any order, each must be followed by its arguments; they
    are all optional)


    This command computes an antenna surface map from a  set  of  holography
    measurements.  The  set of scans (procedure HOLO) should have first been
    calibrated in phase, amplitude and RF passband relative  to  interspaced
    correlation  scans  in  the  direction  of  the source.  The map will be
    computed from the first band and subband sets chosen with  commands  SET
    BAND  and  SET  SUBBAND.  SET  BAND AVERAGE is recommended for continuum
    measurements;  only  continuum  subbands  should  be  used.   For   line
    measurements,  the continuum width of one of the correlator units should
    match the actual line width for better sensitivity.  The antenna  to  be
    studied  should  be  selected  by  command SET ANTENNA i.  Data from the
    baselines linking this antenna  (scanned)  to  other  (fixed)  available
    antennas are averaged.

    The amplitude and phase maps are obtained by Fast Fourier  Transform  of
    the  observed  beam  map. The maps will be square (npix by npix pixels).
    The default for npix is 64, it should be  greater  than  the  number  of
    observed holography scans (usually 16 or 32).

    After FFT a gaussian illumination function is fitted in the  amplitudes,
    giving  the  offset  from  the center (in meters) and the edge taper (in
    dB).  If /PLOT is given, the amplitude map will be shown (in  decibels),
    from  -15  to  0 dB, with contours in steps of 3db (these may be changed
    using amin, amax and astep).

    A lest square fit is used to correct the phases from a  remaining  phase
    offset,  pointing  errors,  and focus offsets. The panel rings following
    FREE are not used for this fit. If /PLOT is given,  the  antenna  normal
    surface errors will be shown, in micrometers, from -500 to 500 mum, with
    contours in steps of 100 mum (these may be changed using keyword  ERRORS
    followed  by  emin,  emax  and  estep).   If  /PLOT  PHASE is given, the
    residual phase map will be plotted instead of surface errors, in radians
    from -pi to pi, with contours in steps of 0.2 radian.

    If this map shows remaining 2*pi discontinuities, or  if  focus  offsets
    larger  that  1mm  are  found,  you  should  try using option /OFFSET to
    correct the phases  for  an  offset  (x,y,z  in  meters)  in  the  focus
    coordinates, before fitting. This should lead to better rms values.

    /PLOT gives also the amplitude illumination pattern, in dB; default plot
    limits are -15dB to 0dB by step of 3dB; use /PLOT AMP amin amax astep to
    change these settings.  If NUMBER is given  as  a  /PLOT  argument,  the
    panels numbers are drawn.


    The rms values for the phase and the normal surface errors  (in  radians
    and  micrometers)  are given, both with and without amplitude weighting.
    The contribution of the illumination amplitude distribution and  of  the
    observed phase errors to the antenna efficiency are given.

    Finally, if nmodes is larger than 0, a listing of  panels  displacements
    is  computed, and written in a file like "panels-an1.dat". This uses the
    parameter nmodes which is the number of modes used for each panel: 1  is
    only  the translation mode (normal to the antenna surface); 3 (the usual
    setting), adds both tilt modes, radial  and  tangential,  but  no  panel
    deformation;  4  adds  a torsion mode and 5 a motion of the panel center
    relative to its edges (there are only 5 screws for each panel, thus only
    5  possible  modes).  In the file "panels-an1.dat" a line for each panel
    is printed. The first two numbers are the panel numbers, followed by  up
    to  five  screw  settings  (three  only  for  the inner ring). All screw
    settings are equal if nmodes was set to  1,  only  one  number  is  then
    printed.

    If niter is not forced to zero, the fit  is  obtained  iteratively:  the
    panel orthogonal deformation modes are computed from the aperture phase,
    then the phase change that  these  deformations  would  have  caused  is
    computed  (by  doing  a  FFT  to  the  beam  map, doing a cut-off at the
    observed map size, followed by a FFT back to the  aperture  plane),  and
    subtracted  from the aperture phase; second order panel deformations are
    computed from these residuals, and so on. The number of iterations niter
    and  a  gain  to  this  iterative  procedure may be specified ([IT niter
    gain]); their default values are 5 and 1.0 . Use IT 0 for  no  iterative
    procedure  at  all.  At  each step the phase residual rms and the rms of
    panel deformations fitted are given (weighted by  the  fitted  amplitude
    illumination and counted perpendicularly to the surface).

    A gildas image file of the results is kept (e.g. "jj-mmm-yyyy-an1.map"),
    in  which  plane  3  in  the amplitude in dB, plane 4 the raw phases and
    plane 2 the residual phase in  radians  (plane  1  contains  the  fitted
    amplitude, i.e.  a Gaussian).

2 BASELINE
        CLIC\SOLVE BASELINE [/OFFSET b1  dx1  dy1  dz1  b2   ...]   [/SEARCH
    range] [/POLYNOMIAL degree]

    This uses a linear method  to   determine   baselines   separately   and
    should  work only if the starting values are within half a wavelength in
    any direction of the true values.  The baselines to be  determined  must
    have  been  selected  by the SET BASELINE command, and the data plotted;
    plot axes must have been previously selected  by  :   SET  X  HOUR_ANGLE
    DECLINATION and SET Y PHASE.

    Use  option  /OFFSET  to  correct   the    phases    for    an    offset
    (dx1,dy1,dz1)  in  baseline  b1  before  fitting.  This is needed if the
    baseline was wrong by more than half a wavelength.  Offsets  are  to  be
    given in meters.

    The results are given as offsets in  meters   to   be   added   to   the
    baseline  used  for  data  acquisition (which may be read by SIC\EXAMINE
    BASELINE).  The total fitted baseline is also given in meters,  as  well
    as  the  rms  of  the residuals in phase units.  Two sets of offsets are
    given:  the first set (dx, dy, dz) are the offsets with respect  to  the
    antenna  positions actually used, while the secoond set (DX, DY, DZ) are
    with respect to the standard antenna coordinates (the default values  in
    OBS).

    The /SEARCH  option  enables   an   automatic   search   with   starting
    offsets  scanning a 3-d box in dx, dy, dz, by steps of half a wavelength
    in the three directions.  The argument range is in meters  (scanning  is
    from  -range/2 to +range/2, default -0.005 to 0.005).  Only the solution
    with the minimum rms is kept.  Searching one baseline in  a  0.01  meter
    range takes 4 seconds on the micro-vax 3400.

    Use command RESIDUALS BASELINE to  display  the  fit  residuals   (phase
    should be constant).

    With SET  ANTENNA  in  action   the   antenna   position   offsets   are
    directly fitted to the antenna phases, ensuring baseline closure.

    Use later command PRINT BASELINE to  create  a  procedure  file   (named
    CLIC-BASELINE.OBS)   containing  the  antenna  position  offsets.   This
    procedure file may be executed by  the  observing  program  OBS  on  the
    control computer BURE01.

    With option /POLYNOMIAL degree, and  if  SET   X   TIME   is   used   in
    addition of HOUR_ANGLE and DECLINATION, a polynomial function of time is
    included in the phase function being fitted.  The degree may range  from
    0 (the default) to 3.  In that case command RESIDUALS will also plot the
    residuals as a function of time.

    In one specify elevation  as  an  additional  X  variable  (e.g.  SET  X
    HOUR_ANGLE  DECLINATION TIME ELEVATION), then an additional parameter is
    fitted: the offsets between elevation and azimuth axes  (or  rather  the
    differences between antennas). These differing offsets result in a phase
    effect proportional to the cosine of elevation. In antenna  mode,  these
    offsets  are  given  for  each antenna in meters. In baseline mode, only
    differences are computed.

    To further correct for this effect use the command MODIFY  AXES.  It  is
    foreseen  to  correct  for this effect in real time, when the values are
    well and unambiguously known.


2 DELAY
        CLIC\SOLVE DELAY   [/SEARCH range interval] [/PLOT]

    This uses a linear method to  determine  delays.  The  baselines  to  be
    determined   must  have   been   selected   by  the SET BASELINE (or SET
    ANTENNA) command, and  the  data  plotted;  plot  axes  must  have  been
    previously selected  by  :   SET  X  I_FREQUENCY and SET Y PHASE.

    The results are given in nanoseconds.

    The /SEARCH  option  enables   an   automatic   search   with   starting
    offsets   from  -range|2  to  +range|2  by steps of given interval.  the
    default range is 200 nanoseconds, with interval of 1 nanosecond.

    With SET  ANTENNA  in   action   the   antenna   delays    are  directly
    fitted to the antenna phases, ensuring delay closure.

    Use later command PRINT DELAY to create a procedure file   (named  CLIC-
    DELAY.OBS)    containing   the  fitted antenna  delays.   This procedure
    file may be executed by  the  observing  program  OBS  on   the  control
    computer BURE01.

    With option /PLOT, the fitted phases pill be plotted over the data.
2 FLUX
        CLIC\SOLVE FLUX [NOREFERENCE] [BEST n]

    Calculate the fluxes of the sources in the current index or the  antenna
    efficiencies  (Jansky  to  Kelvin)  if  the  source  flux is known.  The
    command can also be used to bootstrap source fluxes from a known source.

    It should be used before computing  any  amplitude  calibration,  on  an
    index  covering  a  reasonably  short  time  interval  to avoid possible
    efficiency variations.

    The commands should be used in the following way:

  - The command SET FLUX may be used to define the flux of one,  or  several
    of  the  sources  in  the  current  index  for  which the flux is known.
    Frequencies and dates may be specified in SET FLUX.  Alternatively,  the
    default  efficiencies  stored  in  the  data  header  will  be  used, if
    NOREFERENCE is present.

  - Then the  command  SOLVE  FLUX  will  use  the  sources  of  known  flux
    (optionally  with  matching  frequencies  and  dates)  to  determine the
    efficiencies for all antennas, and  compute  the  fluxes  of  all  other
    sources  using  those  efficiencies.  IF BEST n is present, the antennas
    giving the highest n fluxes will be used for  averaging  (n:  1  to  the
    number of available antennas).

    SOLVE  FLUX  now  gives  the  decorrelation  factor  relative   to   the
    efficiencies  logged  in  the  scan  headers (assumed to be the standard
    single-dish efficiencies).


  -  The command SHOW FLUX will give a list of fluxes either assumed or just
    determined.

  -  The command PRINT FLUX will create a procedure that may be  used  later
    to reload these fluxes in CLIC, if needed.

  -  The command STORE FLUX will store the fluxes  and  efficiencies in  the
    headers of the observations in the current index.

      SOLVE FLUX includes a correction for decorrelation effect,  using  the
    rms  phases computed from the 1-second integration dumps. Use SOLVE FLUX
    RAW to ignore this correction.

      SOLVE FLUX normally requires point sources to be meaningful. There two
    exceptions to this:
  -  Planets, at least the smallest ones.
  -  W3OH, a reasonably strong circumpolar HII region

    These sources  can  be  used  as  flux  calibrators.  Size  effects  are
    corrected  for  by  CLIC,  using the ephemerides to determine the planet
    characteristics, and a simple (but accurate) source model for W3OH.

2 FOCUS
        CLIC\SOLVE FOCUS [/PLOT] [/COMPRESS] [/PRINT]

    Find focus corrections from a  FOCUS  scan.   All  focus  scans  in  the
    current  index are processed by a parabolic fit.  All continuum subbands
    and  both  side  bands  are  averaged.   SET  AVERAG  METHOD  SCALAR  is
    recommended.  The fits may be displayed with option /PLOT.

    The option /COMPRESS may be  used  to  average  data  in  a  given  time
    interval  before  processing,  to  improve  the  signal-to-noise  ratio.
    Default is 4 seconds.

    The presence of option /PRINT produces a procedure file "focus.obs",  to
    be used in OBS for introducing the fitted focus offset.
2 GAIN
        CLIC\SOLVE GAIN [SCAN] [/PRINT]

    Compute the receiver gain ratio (Image  Side  Band  over   Signal   Side
    band)  from correlation data on a continuum source. Compute also the LO1
    and LO3 phases that should be used in real time to have zero  phases  in
    both side bands.

    The data from all the scans in the current index are averaged except  if
    optional  argument  SCAN  is  given,  in  which case the gain ratios are
    computed for each scan.

    Option /PRINT : write a procedure INTER_OBS:gain.obs to  set  the  gains
    (and phases) in OBS.

2 PHASE
        CLIC\SOLVE   PHASE   [/PLOT]    [/BREAK    ...]     [/POLYNOMIAL...]
    [/WEIGHT]

    This will fit a mathematical function into the measured  phases  of  the
    sources  in  the current index (presumably calibrators).  This data must
    have been selected and plotted in axes :  SET   X   TIME   and   SET   Y
    PHASE  for  the  baselines  and  bands  of  interest,  specified  by the
    corresponding  SET  commands.   Phases  should   be   continuous.    The
    calibration  function  is  kept in memory.  Command STORE should be used
    next to store this function in the header of source observations,  after
    a change in the index to select the appropriate scans.

    SOLVE PHASE internally and temporarily resets  SET  PHASE  to  ABSOLUTE.
    The INTERNAL|EXTERNAL mode is kept to allow determining a phase curve on
    top of an external receiver reference.

    Option /PLOT will plot the fitted phase curve over the data.

    Fitted curves may be of two kinds:

  -  Cubic splines (the default).  By default  knots  are  regularly  spaced
    with   an   interval   between   knots   set  by  the  SET STEP command.
    Additional knots may be introduced with the  option:  /BREAK  kind  time
    [kind  time  ...]  a  break introduced at abscissa 'time' ; 'kind' is an
    integer in the  range 0-3; 0 means that a discontinuity will be present,
    1  that  the  first  derivative  will  be   discontinuous,  and  so  on.
    Several  breaks  may  be introduced; the program will detect an error if
    too   many   breaks  are  introduced,  compared  to  the density of data
    points.

  -  Polynomial curves may  be  used  instead.   For  this  the  option  is:
    /POLYNOMIAL  [degree]  indicating  the degree of the polynomial (default
    0).


    Normally the data points are all assigned the same weight  for  the fit.
    With   option  /WEIGHT,  the data points are weighted according to their
    errors.  Errors computed from the  phase  rms  determined  in  the  data
    compression.
2 POINTING
        CLIC\SOLVE POINTING [beam] [/PLOT]
        [/OUTPUT filename [NEW|APPEND] [FLUX]] [/COMPRESS time] [/PRINT]

    Find pointing corrections from POINTING scans.  All pointing   scans  in
    the   current   index   are  processed by a gaussian fit.  All continuum
    subbands and both side bands are averaged.  SET AVERAG METHOD SCALAR  is
    recommended.

    The fits may be displayed with option /PLOT.

    The results may be written on a file if /OUTPUT is given.  The  file  is
    given  extension  .LIS by default; a new file is opened except if APPEND
    is given as a second argument of option /OUTPUT. The file is by  default
    in  a format suitable for the determination of a pointing model (program
    POINT at BURE). The presence  of  optional  argument  FLUX  changes  the
    output format for the determination of relative fluxes (by ASTRO).

    The option /COMPRESS may be  used  to  average  data  in  a  given  time
    interval  before  processing,  to  improve  the  signal-to-noise  ratio.
    Default is 4 seconds.

    Option /PRINT : write a procedure file INTEROBS:pointing.obs  to  update
    the pointing corrections in OBS.
2 FIVE
        CLIC\SOLVE FIVE [beam] [/PLOT]
        [/OUTPUT filename [NEW|APPEND] [FLUX]] [/PRINT]

    Find pointing corrections from FIVE point scans.  All five-point   scans
    in  the  current  index  are processed by a gaussian fit.  All continuum
    subbands and both side bands are averaged.

    The fits may be displayed with option /PLOT.

    The results may be written on a file if /OUTPUT is given.  The  file  is
    given  extension  .LIS by default; a new file is opened except if APPEND
    is given as a second argument of option /OUTPUT. The file is by  default
    in  a format suitable for the determination of a pointing model (program
    POINT at BURE). The presence  of  optional  argument  FLUX  changes  the
    output format for the determination of relative fluxes (by ASTRO).

    Option /PRINT : write a procedure file INTER_OBS:pointing.obs to  update
    the pointing corrections in OBS.
2 TOTAL
        CLIC\SOLVE TOTAL [beam] [/PLOT]  [/PRINT]
        [/OUTPUT filename [NEW|APPEND] [FLUX]] [/COMPRESS time] [/PRINT]

    Find pointing corrections from POINTING scans, but using the total power
    from  each  antenna.   All  pointing  scans  in  the  current  index are
    processed by a gaussian fit.

    The fits may be displayed with option /PLOT.

    The results may be written on a file if /OUTPUT is given.  The  file  is
    given  extension  .LIS by default; a new file is opened except if APPEND
    is given as a second argument of option /OUTPUT. The file is by  default
    in  a format suitable for the determination of a pointing model (program
    POINT at BURE). The presence  of  optional  argument  FLUX  changes  the
    output format for the determination of relative fluxes (by ASTRO).

    The option /COMPRESS may be  used  to  average  data  in  a  given  time
    interval  before  processing,  to  improve  the  signal-to-noise  ratio.
    Default is 4 seconds.

    Option /PRINT : write a procedure file INTER_OBS:pointing.obs to  update
    the pointing corrections in OBS.

2 RF_PASSBAND
        CLIC\SOLVE RF_PASSBAND [da] [dp][/PLOT]

    Solve for  passband  calibration  curves,   by   fitting   it   to   the
    amplitudes  and  phases  measured on a strong continuum source (passband
    calibrator). The behaviour of this command depends on the  current  mode
    of rf passband calibration (Frequency or Channel).
      - for frequency-dependent rf passabnd calibration: the  resolution  is
        normally done using all the spectral subbands plotted together, as a
        function of intermediate frequency. It should be done separately for
        upper  and lower side bands. A single frequency-dependent polynomial
        is fitted, a high degree might be necessary for the phase,  if  band
        edges are used (up to 20 is feasible).

      -  for channel dependent rf passband calibration: (i)  for  continuum,
        the   data   itself  is   directly   stored   as calibration  values
        (this  gives  a channel-dependent passband curve).   In  addition  a
        polynomial   is   fitted   and   optionally  plotted  (this  gives a
        frequency-dependent passband curve).

        (ii) for spectral subbands, polynomials are  fitted  and  optionally
        plotted, as a channel-dependent passband curve.

    The degrees for polynomials are 'da'  for  amplitude,  'dp'  for   phase
    (defaults  0 and 1).  X unit must be channel.  Spectral subbands must be
    plotted  separately.   The  current  index  should  contain  calibration
    observations  of strong continuum sources.  Command STORE should be used
    next to store this function in the header of source observations.

    Both channel dependent  and   frequency   dependent   curves   will   be
    stored;  Use  command  SET RF_PASSBAND FREQUENCY|CHANNEL to apply one or
    the other.

    Option /PLOT will plot the polynomial fits over the data.
2 SKYDIP
        CLIC\SOLVE SKYDIP [TREC|EFF] [/PLOT] [/OUTPUT File [NEW]]

    Compute receiver temperature TREC or antenna forward efficiency EFF from
    skydip   scan.    All  skydip  scans  in  the current index a solved.  A
    graphic display of the solution can be plotted using the  /PLOT  option,
    and data can be written to an output file using the /OUTPUT option.
1 STORE
        CLIC\STORE par

    Writes calibration (or edition) data in the output file.  All  scans  in
    the   current   index   are   processed.   Calibrated  data may later be
    plotted  with  the  PLOT  command,  after  setting  INSTRUMENTAL  and/or
    RF_PASSBAND to ON.
2 AMPLITUDE
        CLIC\STORE AMPLITUDE [PHASE] [/BAND code] [/SELF]

    Store the amplitude (and optionally  phase)  calibration.   Storing both
    calibrations together is more efficient.

    With option  "/BAND  code",  one   may   use   the   calibration   curve
    determined  with  one  of  the  sidebands  (`code'  is  UPPER,  LOWER or
    AVERAGE), to calibrate both sidebands.

    With option "/SELF", the calibration stored will not be the  calibration
    curve determined with the last SOLVE AMPLITUDE [or PHASE], but, for each
    scan, the visibility corresponding to the first subband  set  (eg.,  SET
    SUB  L01 to L03 ...); data from each side band will be used to calibrate
    the same side band. This provide a simple, easy way  to  calibrate  data
    taken on strong continuum sources (quasars).
2 CORRECTION
        CLIC\STORE CORRECTION GOOD|BAD|AUTO|SELF [tmin] Stores in the header
    of  each  scan  (of the current index) the information whether the phase
    correction is or not declared valid, and should be actually applied when
    SET PHASE ATM is selected.

    If AUTO, that information is determined on the phase  calibrators  (type
    PHASE),  by  comparing  the  amplitudes with and without the correction.
    This  information  is  then  propagated  to  the   neighbouring   source
    observations  (type  OBJECT,  in a +- tmin minutes time window).  `tmin'
    interval (in time minutes) defaults to 15 minutes.

    If SELF, that information is determined on the source, whatever its type
    may be, by comparing its amplitude with and without the correction.


2 FLAG
        CLIC\STORE FLAG f1 f2 ...  [/ANTENNA a1 a2 ...   ] [/BASELINE b1  b2
    ...] [/BAND b] [/RESET]

    Flag all data in the current index  according  to  the  parameters   and
    option  specified.   This  is  equivalent  to  the following sequence of
    commands
          CLIC\MODIFY DATA
     with a DATA.CLIC procedure containing
          FLAG f1 f2 ... [/ANTENNA a1 a2 ...] [/BASELINE b1 b2 ...] [/RESET]
          GO WRITE
     but it is simpler and faster (however, all  the   data   records   will
    be flagged).
2 FLUX
        CLIC\STORE FLUX

    Store the source fluxes and  antenna  efficiencies  determined  from   a
    previous SOLVE FLUX command. Source names, frequencies (within 1GHz)
     and dates (within a week) must match.

2 PHASE
        CLIC\STORE PHASE [AMPLITUDE] [/BAND code] [/RECEIVER irec]

    Store the phase (and optionally  amplitude)  calibration.   Storing both
    calibrations together is more efficient.

    With option  "/BAND  code",  one   may   use   the   calibration   curve
    determined  with  one  of  the  sidebands  (`code'  is  UPPER,  LOWER or
    AVERAGE), to calibrate both sidebands.

    With option "/SELF", the calibration stored will not be the  calibration
    curve determined with the last SOLVE PHASE [or AMPLITUDE], but, for each
    scan, the visibility corresponding to the first subband  set  (eg.,  SET
    SUB  L01 to L03 ...); data from each side band will be used to calibrate
    the same side band. This provide a simple, easy way  to  calibrate  data
    taken on strong continuum sources (quasars).

    With option "/RECEIVER irec", the calibration curves solved  using  data
    from  receiver  "irec"  will  be  stored  in  parallel  with  any  other
    calibration curve.  This phase curve will  be  selected  by  giving  SET
    PHASE EXTERNAL.  (see this command). This has no meaning for amplitudes.

    /BAND may be used in conjunction with /RECEIVER.

2 QUALITY
        CLIC\STORE QUALITY code

    Store the data quality to be used as  a  selection  criterion.  All  the
    scans  in  the  current  index are tagged. Code may be an integer in the
    range 0-9, or drectly the corresponding quality word:
  0 Unknown
  1 Excellent
  2 Good
  3 Fair
  4 Average
  5 Poor
  6 Bad
  7 Awful
  8 Worst
  9 Deleted


2 RF_PASSBAND
        CLIC\STORE RF_PASSBAND

    Store the Continuum and/or  Line   RF   passband   calibration   curves.
    Both   channel   dependent   and  frequency  dependent  curves  will  be
    simultaneously stored.  Caution:  Line RF  passbands  should  be  stored
    only for consistent spectral correlator configurations.
1 TABLE
        CLIC\TABLE Name Status [/RESAMPLE nc ref val inc code  shape  width]
    [/COMPRESS tmax uvmax] [/FREQUENCY name rest-freq] [/DROP  n1 n2] [/FFT]

    This command will create a UV data Table from  the  current  index.  not
    given, the most recently created table will be  extended.   'Status' may
    be  OLD  (default  value  if  not  specified)  to  extend  and  existing
    table, or NEW to create a new table.

    The bands and subbands used are given by command SET SELECTION (See HELP
    SET SELECTION).

    The weighting modes are given by command SET WEIGHTS.

    Option /RESAMPLE enables to resample data on a new  spectral  grid  (for
    line  data).  'nc' is the output number of channels, 'ref' the reference
    channel, 'val' the value of velocity or frequency offset  (with  respect
    to  the  rest frequency) at the reference channel, 'inc' the resolution,
    'code' is "V" if the  value  'val'  and  the  resolution  'inc'  are  in
    velocity  units,  "F"  for  frequency units.  The reference channel thus
    corresponds to the given 'val' velocity, or to the offset 'val'  in  MHz
    from  the  rest  frequency  present  in the header or modified by option
    /FREQUENCY.

    Resampling is done by default  through  linear  interpolation  of  input
    channel data.

    Resampling may also be done (using option  /FFT)  in  Fourier  space  by
    cut-off  or  extrapolation  (by zeroes) of the Fourier components, after
    deconvolution by the channel response of the correlator (due to  on-line
    apodization),   and  followed  by  reconvolution  to  produce  frequency
    channels of the given shape and width. Allowed shapes are:

      TBox = a box in delay space (unapodized  correlator)
      Ppar = a parabola in delay space (apodized correlator) (the default)
      FBox = a box in frequency space (square filter)
      FTri = a triangle in frequency space (Hanning smoothed square filter)

    The width is the channel width in units of channel  separation  (default
    1).

    Option /FFT is not recommended when joining together several subbands to
    produce  a single spectrum, with a limited number of broad channels.  In
    those cases using the FFT could produce a spectrum with "holes"  at  the
    points between subbands with limited overlap.

    Option /FREQUENCY is used to redefine  the  rest  frequency  (and   line
    name) for the output table.  The velocity scale is computed accordingly.
    This rest frequency will correspond to the reference channel  in  option
    RESAMPLE.

    Option /DROP enables to drop the first 'n1' and last 'n2'   channels  in
    each  subband  of  the  OLD  spectral  correlator.  For the NEW spectral
    correlator (data taken  since  summer  1992),  it  is  replaced  by  the
    commands SET GIBBS and SET DROP.

    Option /COMPRESS is used to compress  the  data   before   writing   the
    table.   This  works like the COMPRESS command, but no intermediate file
    is written.

    A UV data Table is a file in the Gildas Data Format,  of   dimension  2.
    Each   column  corresponds  to  a  visibility data point.  Lines contain
    respectively:
  1.  U in meters
  2.  V in meters
  3.  W in meters
  4.  Observation date (integer CLASS Day Number)
  5.  Time in seconds since above date
  6.  Number of start antenna
  7.  Number of end antenna
  8.  First frequency point (real part)
  9.  First frequency point (imaginary part)
  10.  First frequency point (weight = integration  time  x  frequency width
    in  MHz divided by the product of system temperatures of both antennas);
    see SET WEIGHTS to select the weighting modes.
  11.  Same for second frequency point, and so on.  The first  dimension  is
    then  the  3 *  nchan  +  7,  for  nchan  frequency channels; The second
    dimension is the number of UV points measured.  For use with GreG COLUMN
    command,  this  UV  Data  Table  must  be   transposed   by  Gildas Task
    TRANSPOSE.
1 TAG
        CLIC\TAG Quality_Code List_of_Observations

    Attributes a quality to a given list of Observations.   Quality_Code  is
    an integer in the range 0-9, and the recommended quality scale is

  0 Unknown
  1 Excellent
  2 Good
  3 Fair
  4 Average
  5 Poor
  6 Bad
  7 Awful
  8 Worst
  9 Deleted

    The operation is immediate  and  occurs  in  the  OUTPUT  file  for  all
    versions  of  all  Observations  specified  in  the list.  If no list is
    given, the R  memory  is  attributed  the  specified  quality.   A  FIND
    operation  will  only  select  Observations of quality better than (i.e.
    less or equal to) the quality specified by the SET QUALITY  command,  or
    in the /QUALITY option.
1 VARIABLES
        CLIC\VARIABLES group state

    This command is used to enable/disable CLIC variables.  'state'  may  be
    ON   or   OFF;   12  groups of variables are available, corresponding to
    sections in the scan headers.
  READ_WRITE     Input/Output file information (Global)
  GENERAL        General information (Scan based)
  POSITION       Source related information (Scan based)
  CONFIG         Array configuration related information (Scan based)
  RF_SETUP       Receiver related information (Scan based)
  CONTINUUM      Continuum correlator related information (Scan based)
  LINE           Spectral correlator related information (Scan based)
  SCANNING       Special scan information (Record based)
  ATMOSPHERE     Atmospheric calibration parameters and results (Scan based)
  DESCRIPTOR     Data descriptor information (Scan based)
  DATA_HEADER    Data header information (Record based)
  DATA_RECORD    Data values (Record based)

    Scan or Record based variables variables refer to the last read scan  or
    record  (explicitely  by  GET/RECORD,  or  implicitely  by PLOT or other
    commands).
2 READ_WRITE
        CLIC\VARIABLES READ_WRITE ON|OFF

    Input/Output file related variables
  IN_FILE          Name if input file
  OUT_FILE         Name of output file
  INBLOC           Block of observation in input file
  IDATA            Address od data section in input observation
  INSEC            Number of sections in header
  INEXT            Next available block in input file
  ONEXT            Next available block in output file
  IXNUM            Index number of current observation in input file
  ISEC [INSEC]     Header sections
  ILEN [INSEC]     Length of header section (words)
  IADD [INSEC]     Addresses of header sections (words)
  IXNEXT           Next available entry in input file index
  OXNEXT           Next available entry in output file index
  CXNEXT           Next available entry in current index
  INWORD           Number of words in current observation
  IDATAL           Length (words) of data section
  MODIFY           (Logical) data is open for modify
  SHARE            (Logical) Output file is shared
  FOUND            Number of observations in current index
  IX_NUM [ ]       Observation numbers in input file index
  IX_BLOC [ ]      Blocks numbers of observations in input file
  OX_NUM [ ]       Observation numbers in output file index
  OX_BLOC [ ]      Blocks numbers of observations in output file
  CX_NUM [ ]       Observation numbers in current index
  CX_BLOC [ ]      Blocks numbers of observations in current index
2 GENERAL
                  CLIC\VARIABLES GENERAL ON|OFF

         General information related variables
  TELESCOPE                Telescope name
  NUMBER                   Observation number
  VERSION                  Observation version number
  DOBS                     Day of observation (internal format)
  DATE_OBSERVED            Day of observation (in clear)
  DRED                     Day of last reduction (internal format)
  DATE_REDUCED             Day of last reduction (in clear)
  DATATYPE                 Type of observation (4 for interferometer data)
  RQUAL                    Quality of observation (0-9)
  QUALITY                  Quality of observation (Excellent, ... Awful)
  SCAN                     Scan number
  UTOBS                    Time of observation (radians!)
  TIME_OBSERVED            Time of observation (hh:mm:ss.ss)
  LSTOBS                   Sidereal time of observation (radians)
  AZIMUTH                  Azimuth of source direction (radians)
  ELEVATION                Elevation of observation (radians)
  TIME                     Integration time (minutes)
  PROC                     Procedure used (internal format)
  PROCEDURE                Procedure used (in clear)
  TYP_OFF                  Type of offsets
2 POSITION
                  CLIC\VARIABLES POSITION ON|OFF

         Source related information
  SOURCE                   Source name
  LAMBDA                   Source longitude-like coordinate (radians)
  BETA                     Source latitude-like coordinate (radians)
  OFF_LAMBDA               Offset in lambda (radians)
  OFF_BETA                 Offset in beta (radians)
  EPOCH                    Epoch of coordinates (if equatorial)
  PROJECTION               Projection used for offsets
  FOCUS                    Focus position used
  FLUX                     Source flux (Jy) for calibrators
2 CONFIG
                  CLIC\VARIABLES CONFIG ON|OFF

         Array configuration related information
  NANT                     Number of antennas
  NBAS                     Number of baselines
  HOUR_ANGLE               Hour angle of observation (hours)
  STATION [NANT]           Positions of antennas
  PHYS_ANT [NANT]          Antenna physical numbers
  CORR_INPUT [NANT]        Correlator input connected for each antenna
  START_ANTENNA [NBAS]     First antenna of baseline
  END_ANTENNA [NBAS]       Second antenna of baseline
  BASELINE [3,NBAS]        Coordinates of baselines (meters)
  ANTENNA [3,NANT]         Coordinates of antennas (meters)
  AXES_OFFSET [NANT]       Offsets of El axis from Az axes (meters)
2 RF_SETUP
                  CLIC\VARIABLES RF_SETUP ON|OFF

         Receiver related information
  LINE                     Line name (in OBS)
  FREQUENCY                Rest Frequency (in OBS) (MHz)
  ISB                      Side band (1:upper, 2:lower)
  LOCK                     Lock
  FLO1                     Frequency of First LO (MHz)
  FLO2                     Frequency of Second LO (MHz)
  FIF1                     First intermediate frequency (MHz)
  VELOCITY                 Velocity entered in OBS (km/s)
  TYPE_VEL                 Velocity type
  DOPPLER                   Doppler correction factor (v/c)
2 CONTINUUM
                  CLIC\VARIABLES CONTINUUM ON|OFF

         Continuum correlator related variables
  N_SIDEBANDS              Number of present sidebands
  N_SUB_BANDS              Number of continuum sub-bands
  NCDAT                    Total number of channels (sidebands x subbands)
  CRCH [2]                 Reference channel for sideband
  CVOFF [2]                Velocity for sideband
  CVRES [2]                Velocity resolution
  CRFOFF [2]               Rest frequency (MHz)
  CRFRES [2]               Frequency resolution
  CNAM_U                   Line name for Upper side band
  CNAM_L                   Line name for lower side band
  CFLO3 [10]               LO3 frequency for subband
  CFWID [10]               Width of subband (MHz)
2 LINE
              CLIC\VARIABLES LINE ON|OFF

             Spectral correlator related information
  N_LINE_BANDS             Number of line subbands
  FOURIER                  (Logical) FFT done, data in frequency space
  TOTAL_CHANNELS           Total number of line channels
  N_CHANNELS [nsubband]           Number of channels in subband
  FIRST_CHANNEL [nsubband]        First channel in subband
  LFCEN [nsubband]                 LO3 frequency (channel 1)
  LFRES [nsubband]                 Frequency resolution (signed)
  REF_CHANNEL [2,nsubband]        Reference channel for spectrum
  F_RESOLUTION [2,nsubband]       Frequency resolution
  F_OFFSET [2,nsubband]           Rest frequency in reference channel
  V_RESOLUTION [2,nsubband]       Velocity resolution
  V_OFFSET [2,nsubband]           Velocity in reference channel
  R_LILEVU [nsubband,nant] Sampling levels (USB)
  R_LILEVL [nsubband,nant] Sampling levels (LSB)
2 SCANNING
                  CLIC\VARIABLES SCANNING ON|OFF

         Special scans (Pointing, Focus, Calibrate and Skydip)
  SCAN_TYPE                Type of special scan (1 focus 2,3 point
                             4,5 calibr)
  MOBIL [NANT]             Antennas in motion
  COLL_AZ [NANT]           Collimation in azimuth (arc sec)
  COLL_EL [NANT]           Collimation in elevation (arc sec)
COR_FOC [NANT]           The Z focus correction in mm.
2 ATMOSPHERE
                  CLIC\VARIABLES ATMOSPHERE ON|OFF

         Atmospheric calibration
  PRESSURE                 Pressure in hectopascals (zero alt.)
  AMBIANT_T                Outside temperature (K)
  ALTITUDE                 Altitude in kilometers
  HUMIDITY                 Humidity in %
  WATER [NANT]             Water content (mm)
  TAU_S [NANT]             Optical depth in signal side band
  TATM_S [NANT]            Temperature of atmosphere in signal side band
  TAU_I [NANT]             Optical depth in image side band
  TATM_I [NANT]            Temperature of atmosphere in image side band
  BEAM_EFF [NANT]          Beam efficiency
  FORWARD_EFF [NANT]       Forward efficiency
  T_CHOPPER [NANT]         Temperature of ambiant load (K)
  T_REC [NANT]             Receiver temperature (K)
  GAIN_IMAGE [NANT]        Gain ratio image/signal
  CHOPPER_COUNTS [NANT]    Measured counts on ambiant load
  SKY_COUNTS [NANT]        Measured counts on sky
  T_SYS_S [NANT]           System temperature (signal band)
  T_SYS_I [NANT]           System temperature (image band)
  CHOPPER_EFF [NANT]       Chopper efficiency
  CAL_MODE [NANT]          Calibration reduction mode
2 DESCRIPTOR
                  CLIC\VARIABLES DESCRIPTOR ON|OFF

         Data descriptor information
  N_DUMPS                  Number of records
  HEADER_LENGTH            Length of data header (words)
  CONT_LENGTH              Length of continuum data (words)
  LINE_LENGTH              Length of line data (words)
2 DATA_HEADER
                  CLIC\VARIABLES DATA_HEADER ON|OFF

         Data header information
  DH_DUMP                  Record number
  DH_OBS                   Date of observation (in internal format)
  DH_DATE                  Date of observation (in clear)
  DH_INTEG                 Integration time in seconds
  DH_SVEC[3]               EQ coordinates of source direction
  DH_AFLAG [NANT]          Antenna flag word
  DH_TOTAL [NANT]          Total power
  DH_DELCON [NANT]         Delay used for continuum correlator (ns)
  DH_DELLIN [NANT]         Delay used for line correlator (ns)
  DH_DELAYC [NANT]         Computed delay (ns)
  DH_DELAY [NANT]          Delay offset (ns)
  DH_PHASEC [NANT]         Computed LO1 phase
  DH_PHASE [NANT]          LO1 Phase offset
  DH_RATE [NANT]           Computed fringe rate
  DH_CABLE [NANT]          Phase of IF cable (at LO2 frequency)
  DH_OFFFOC [NANT]         Focus offset (mm)
  DH_OFFLAM [NANT]         Azimuth offset (arc sec) in pointing scans
  DH_OFFBET [NANT]         Elevation offset (arc sec) in pointing scans
  DH_UVM [2,NBAS]          U and V for baseline (meters)
  DH_RMSPE [2,NANT]        AZ and EL pointing errors (rms, in arc sec.)
  DH_UTC                   UT Time (sec)
  DH_TIME                  UT Time (hh:mm:ss.ss)
  DH_ATFAC [2,NANT]        Atmosphecic calibration factor (K)
                             [sideband,ant]
  DH_BFLAG [NBAS]          Baseline Flag word
  DH_INFAC [2,2,NBAS]      Instrumental factor
                             [real/imag,upp/lower,baseline]
2 DATA_RECORD
                  CLIC\VARIABLES DATA_RECORD ON|OFF

         Data  values  DATA_C  [CONT_LENGTH]       Continuum   data   DATA_L
    [LINE_LENGTH]      Line  data  The  following  additional  variables are
    computed by command MINMAX:
  C_AMPMAX_U [NBAS]        Maximum amplitude, continuum, USB
  L_AMPMAX_U [NBAS]        Maximum amplitude, line, USB
  C_AMPMAX_L [NBAS]        Maximum amplitude, continuum, LSB
  L_AMPMAX_L [NBAS]        Maximum amplitude, line, LSB
  C_AMPMIN_U [NBAS]        Minimum amplitude, continuum, USB
  L_AMPMIN_U [NBAS]        Minimum amplitude, line, USB
  C_AMPMIN_L [NBAS]        Minimum amplitude, continuum, LSB
  L_AMPMIN_L [NBAS]        Minimum amplitude, line, LSB
























