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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.
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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