1 DISMOUNT
        DISMOUNT

    Logically dismount the tape. The tape is not unloaded by this command.
1 HEADER
        HEADER [Filename]

    Without argument, list the next header on tape. The tape is left at  the
    end  of the file, ready to read the next header, or may be it is left at
    the beginning of the current file, ready to process the same file header
    again, I can't remember.

    With an argument, list the header for the specified FITS file.

1 IMAGE
        [FITS\]IMAGE Name

    Define the GILDAS file to be used for the next READ or WRITE commands.
1 INIT
        INIT

    Initialize the tape without any label (standard FITS tape).
1 Language
                        FITS\ Language Summary
                FITS to GILDAS image data format translator

    This program converts GILDAS images on disk to FITS files on tape or  on
    disk,  and  vice  versa.  Switching from tape to disk mode is done using
    command FILE, while switching from disk  to  tape  mode  is  done  using
    command MOUNT.

    DISMOUNT        : Logically dismounts the tape
    INIT            : Initializes the tape
    HEADER          : Lists the next header
    IMAGE Name      : Defines the file name for the next READ or WRITE.
    LIST [Keyword]  : List headers of all files from current position
    MOUNT           : Logically mounts the tape
    READ            : Reads the current file to create a new GDF image
    REWIND          : Rewinds the tape
    SKIP N          : Skips N files on tape
    SET Arg         : Customize the GFITS reading program.
    WRITE           : Writes the current image at end of tape.

1 LIST
        LIST [Keyword]

    List headers of all files  from  current  position.   If  a  Keyword  is
    specified, only this keyword will be listed.  The list can be aborted by
    <^C>, but I am not quite sure about what the tape position will be after
    such an horrible action...

1 MOUNT
        MOUNT [Device:]

    Logically mount the tape on the specified tape drive, or  by default the
    one  indicated  by the logical name TAPE_DEVICE.  This must be done once
    for each tape before any other command (included INIT).

1 READ
        READ [Filename] [/BLC Bx [By [Bz[ Bt]]]] [/TRC Tx [Ty [Tz [Tt]]]]

    Without argument, read from tape the current FITS file to create  a  new
    GDF  image.  Options /BRC and /TRC can be used to select a subset of the
    input FITS image only.

    With argument, read from the specified FITS file.
2 /BLC

    Define the bottom left corner of the input FITS file to  be  considered.
    Bx  By Bz Bt indicates the pixel coordinates of this bottom left corner.
    Trailing arguments (if the image has less  than  4  dimensions)  can  be
    omitted, and 0 means 1.

2 /TRC

    Define the top right corner of the input FITS file to be considered.  Tx
    Ty  Tz  Tt  indicates  the  pixel  coordinates of this top right corner.
    Trailing arguments (if the image has less  than  4  dimensions)  can  be
    omitted, and 0 means the actual dimension.

1 REWIND
        REWIND

    Rewind the tape
1 SET
        SET Argument Value

    Define some FITS program parameters.
2 BLANKING
        SET BLANKING Breal

    Indicates the blanking value to be used.
2 BLOCKING
        SET BLOCKING Factor

    Indicates the desired tape blocking factor  (for  GILDAS  to  FITS  tape
    only). Factor is an integer number from 1 to 10.
2 NBITS
        SET NBITS Value

    Indicates the desired number of bits. Valid values are 16, 32,  and  -32
    for IEEE real numbers.
2 NOPROMPT
        SET PROMPT or SET NOPROMPT

    To indicate wether non standard FITS keywords  require  user  input  for
    interpretation or not.
2 PROMPT
        SET PROMPT or SET NOPROMPT

    To indicate wether non standard FITS keywords  require  user  input  for
    interpretation or not.
2 STYLE
        STYLE Arg

    Define the FITS "Style"  of  the  tape.   FITS  has  unfortunately  many
    "styles"  because  the  keywords  are not fully normalized. This program
    recognizes automatically some keywords but for some  cases  the  "style"
    must be specified either to obtain a proper GILDAS image header from the
    FITS tape, or to write the appropriate FITS format (e.g. UVFITS).

      - STANDARD  Normal FITS tape
      - CPC       Chopped  Photometric  Channel  from  the  IRAS  satellite.
        Images are 3-D with 1 plane for each band, and the projection system
        is almost a RADIO one (but not quite exactly). For  FITS  to  GILDAS
        only.
      - SPLINE    Spline maps from the IRAS satellite. Projection system  is
        GNOMONIC  (but  not  with  standard  keywords),  and in addition the
        correct calibration is applied according to  the  note  by  Francois
        Boulanger. For FITS to GILDAS only.
      - UVFITS    UV FITS tape.

1 SKIP
        SKIP N

    Skip N files on tape.  N can be positive or negative. N = * can be  used
    to go at the logical end of tape.

1 WRITE
        [FITS\]WRITE [Filename]

    Without argument, write the current image (as defined by command  IMAGE)
    to the output tape. The tape is moved to end of tape before writing.

    With argument, create a disk FITS file with the specified name.
1 END