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        [PDBI\]LINE  Name  Frequency Band [Lock [Center [Harm]]] [/MOLECULES
    File] [/SPECTRAL Unit Bandwidth IF_2] /WIDTH width
        [PDBI\]LINE /SPECTRAL Unit Bandwidth IF_2
        [PDBI\]LINE /AUTO

    Plot rest frequency coverage of Plateau de Bure Interferometer using the
    OLD  receiver  system  (replaced  in  2006/2007).  The command syntax is
    identical to that of the corresponding command in OBS.
        Name is a line name to label the plot
        Frequency is the center frequency in GHz
        Band should be USB or LSB
        Lock (optional) is LOW or HIGH
        Center (optional), the center IF2 frequency in MHz, default 350.
        Harm (optional), the harmonic number.
    The option /MOLECULES enables to plot the rest  frequencies  of  several
    transitions, found in file File. This is 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+'
    The option /WIDTH width is used to introduce a finite  width  (in  km/s)
    for the molecular lines displayed.

    The  option /SPECTRAL is used to overlay the desired spectral correlator
        Unit is the correlator unit number (1 to 8)
        Bandwidth is the bandwidth in MHz (20, 40, 80 or 160)
        IF_2 is the center frequency (in MHz) of the unit in the  second  IF
        (in the range 110 to 590 MHz).

    With  only  the /SPECTRAL option, the corresponding unit overlay will be
    drawn on an existing LINE plot.

    Because only one synthesizer is used to generate the 1st  and  2nd  LOs,
    the IF frequency is slightly variable (between 1.500 and 1.550 GHz), and
    the Doppler tracking is correct only for  the  specified  band  (USB  or
    LSB).   The last specified source is used to get the Doppler shift.  The
    image frequency doppler shift is wrong by at most 2.Ers/Harm, where  Ers
    is  the Earth rotation speed, or about 0.9 km/s, roughly 0.04 km/s at 86

    The option /AUTO is used to guess the line frequencies and spectral set-
    up for Bure, given a set of variables:
    N_LINE     int  number of line frequencies
    N_CONT     int  number of continuum frequencies
    for each of N_LINE:
    LINENAME_i char line name of line table
    LINEVELO_i char velocity range (2 values: min, max  in km/s)
    LINEFREQ_i dble line frequency (MHz)
    LINEVRES_i dble velocity resolution (km/s)
    for each of N_CONT:
    CONTTABLE_i char  name of continuum  table
    CONTBANDS_i char  range of frequency bands for the continuum
                      (min1 max1 min2 max2 ...)
    Output  is also in a set of variables, used by setup writing procedures.
    look into LINE_* and SPEC_* variables.

Gildas manager 2019-02-18