In its processing, tvflag
usually produces a gap in its display
every time the source being observed is changed. When mosaicing, this
can very quickly mount up to taking the entire display (and tvflag
will complain about not being able to determine an appropriate averaging
interval). In this case,
options=nosrc can be used to suppress the
gap and allow tvflag
to average across source changes.
For example, assuming a dataset containing calibrators and an observation of the LMC (with appropriately named fields), the following inputs will generate datasets for the calibrators and a single dataset for all the LMC data.
|vis=mosaic.uv||The input dataset.|
|options=mosaic||Assume mosaic experiment, so create|
|multi-pointing output where necessary.|
select=decselection sub-commands can be useful to extract or manipulate a subset of the visibility data.