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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
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:
where Freq is the rest frequency in GHz and 'chain' the line name to
be plotted by GreG, between single quotes. Example:
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.