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SET SELECTION
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). DSB may be used in conjunction 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 desired frequency range
(as given in the command TABLE), thus allowing to mix in the same
table data from USB and LSB, if different frequency setups have been
used in different configurations.
- 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....
Gildas manager
2011-04-01