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PLOT

    [PDBI\]PLOT [LINE|NARROW|WIDEX] [FREQUENCY!BASEBAND i]
             [/LIMITS min max]
             [/MOLECULES FileName [Mol1 Mol2 ... Moln]]
             [/WIDTH width]
             [/SPURIOUS [NO]]
             [/ATMOSPHERE [water]]

    The  PLOT command is used to change the plot options and update the plot
    accordingly. Three types of plots can be produced for the Plateau de Bu-
    re:

    o LINE mode = plot of the LSB and USB (as produced by the LINE command).
    Note that the new generation receivers at PdBI are single-side band: the
    image  sideband  appears in light grey.  Widex and Narrow-band units are
    indicated.

    o  NARROW mode = SSB plot of the two selected entries of the narrow-band
    correlator. This plot is aimed at zooming on the two 1 GHz inputs of the
    correlator, as selected by the NARROW_INPUT command.  The  position  and
    width of the 8 spectral units are drawn.

    o WIDEX mode = plot of the WIDEX frequency coverage.

    After  each  of  the  LINE, NARROW_BAND, SPECTRAL or WIDEX commands, the
    plot is updated.

    Similar plots can be produced for the ALMA correlator:

    o FREQUENCY mode = plot of the LSB and USB ouptut of the  receiver  band
    (as produced by the FREQUENCY command).

    o BASEBAND mode = plot of the baseband #i. The position and width of the
    spectral windows defined with SPWINDOW are also drawn.

    ----------------------------------------------------------------

    Various options are available to fine-tune the plot:

    PLOT /LIMITS min max (in MHz) selects the IF range to be plotted (in the
    LINE mode only). This is to zoom on a specific part of the 4 GHz receiv-
    er bandwidth.

    PLOT /MOLECULES FileName [Mol1 Mol2 ... Moln]   enables to plot the rest
    frequencies  of  several transitions, found in file FileName. Default is
    to use the molecule.dat file, disctributed with ASTRO. These  file  must
    be a text file with entries:
        Freq   'chain'
        where Freq is the rest frequency in GHz and 'chain' the line name to
        be plotted by GreG, between single quotes. Example:
        88.632  'HCN'
        89.081  'HCO\u+'

    PLOT /WIDTH width is used to introduce a finite width (in km/s) for  the
    molecular lines displayed.

    PLOT  /SPURIOUS  plots  the location of possible spurious lines (Plateau
    deBure), at IF1=4500 MHZ, 6300 MHz, and at 3 and 4 times the LO1REF fre-
    quency. This is now the default, it can be deactivated with PLOT /SPURI-
    OUS NO

    PLOT /ATMOSPHERE water plots the atmospheric transmission curve  (verti-
    cal  scale is from 0 to 1) as a function of the frequency. The amount of
    precipitable water can be given, default is 1 mm.  The  transmission  is
    computed  on-the-fly  using  the  ATMOSPHERE  command (see corresponding
    help). The command ATMOSPHERE /PRINT can be used to list the  input  pa-
    rameters  that were used. The ATM model version can be changed using the
    SET ATM OLD|NEW command (the NEW version is recommended).


Gildas manager 2011-09-07