LINE OLD
Keywords: astro

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LINE OLD

            [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
        configuration.
            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
        GHz.

        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.