LINE

    [PDBI\]LINE Name Frequency Band [Lock [Center [Harm]]]
      or
        [PICO\]LINE Name Frequency Band [Center]

    30-m:
        Define and plot the receiver frequency coverage of the EMIR 30-m re-
    ceiver

    PdBI:
        Define and plot the receiver frequency coverage of  the  Plateau  de
    Bure  Interferometer (with the receivers installed in winter 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 rest frequency in GHz
        Band      should be USB or LSB
        Lock      is LOW or HIGH [optional, default LOW]
        Center    is the IF1 frequency in MHz [optional, default 6500]
        Harm      is the harmonic number [optional]

    o  The receiver band to be used (1 to 4) will be determined by the soft-
    ware.

    o The center frequency is expressed in the first IF (4-8 GHz = 4000-8000
    MHz). WARNING: it is highly not recommended to center the line frequency
    at 6 GHz. This is because the correlator analyses quarters of the 4  GHz
    bandwidths,  and  6  GHz is very precisely at the limit between two such
    adjacents quarters.

    o The plot displays the four "quarters" Q1...Q4 that can be selected  as
    input for the correlator (see NARROW_INPUT command):
      Q1 = 4.2-5.2 GHz, Q2 = 5.0-6.0 GHz
      Q3 = 6.0-7.0 GHz, Q4 = 6.8-7.8 GHz

    o  Commands  NARROW and SPECTRAL are available to setup the IF processor
    and the spectral units of the narrow-band  correlator  (see  the  corre-
    sponding help). A typical ASTRO session would look like:

    line toto 100 usb           ! choice of rx tuning
    narrow q1 q3                ! choice of the correlator windows
    spectral 1  20 320 /nar 1   ! correlator unit 1
    spectral 2 320 200 /nar 2   ! correlator unit 2
    spectral 2 320 210 /nar 2   ! new def. of unit 2 --> plot is updated

    o  Command  PLOT can be used to plot the full receiver coverage, that of
    the NARROW band correlator, or that or the WIDEX correlator.

    o LINE can also be used to produce plots of the  frequency  coverage  of
    the old receivers (replaced in 2006/2007). The command SET PDBI year al-
    lows one to select the instrument as of the selected year:
    - 1995: 3 and 1.3 mm receivers, 500 MHz bandwidth
    - 2000: 3 and 1.3 mm receivers, 580 MHz bandwidth
    - 2006: new generation receivers (4 GHz bandwidth, 2 polar.) [default]
    For the OLD receivers (years 1995 & 2000), the  commands  NARROW,  SPEC-
    TRAL,  PLOT are not active. Please enter HELP LINE OLD for a description
    of the behaviour of the LINE command in that case.