Next: SET SOURCE
Previous: SET SCAN
CLIC\SET SELECTION mode band subband-list [FREQUENCY freqout]
[/WINDOW fmin fmax [fmin2 fmax2 ...]]
Choose the type of data selection to be done by command TABLE (to create
an output UV table).
- The first argument 'mode' is CONTINUUM or LINE, to prepare single
channel or multiple channel maps.
- The second argument is the sideband to be used: UPPER (or USB), LOW-
ER (or LSB), AVERAGE (or DSB), AUTO or SSB. DSB may be used in con-
junction with CONTINUUM: in this case, two separate visibility
points are written, one for each sideband. DSB used in conjunction
with LINE means that the side band will be selected to match the de-
sired frequency range (as given in the command TABLE), thus allowing
to mix in the same table data from USB and LSB, if different fre-
quency setups have been used in different configurations. AUTO will
determine for each narrow input whether the receiver tuning is DSB
or SSB and accordingly select DSB (write a visibility for each side-
band) or the signal sideband if SSB. SSB will write one visibility
for the signal side band (automatically determined). This last two
options are useful for continuum only. For LINE, they will just se-
lect the matching side band as does DSB.
- The third argument is a subband list.In CONTINUUM mode, subbands are
averaged, in spectral mode they are combined to produce a single
spectrum. The subband list is given with the same syntax as in the
SET SUBBAND command, e.g. "n1 to n3" or "n1 to n3 and n5".
Example: SET SELECTION CONTINUUM USB C01 AND C03 AND C05 selects contin-
uum data, USB, and the subbands C01, C03, and C05.
Arguments "FREQUENCY freqout" are used only for CONTINUUM tables. They
define the frequency (in MHz) used for mapping purposes. U and V (for
each side band in DSB mode) will be scaled to this frequency. This is
intended to combine maps obtained in continuum at slightly different
frequencies. The default for freqout is the actual observing frequency
, or the frequency used for previous data if data is appended to a pre-
viously existing table by the TABLE command.
Option /WINDOW is used to avoid spectral lines when producing a continu-
um table from spectral correlator data. The first two rest frequencies
(in MHz) give the first frequency window in which data is to be used,
the next two give the second frequency window, etc....