Keywords: imager

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## In CASA

The steps in CASA involve

1. Separating spectral windows and different sources into independent (temporary) MS
2. Getting rid of flagged data
3. Setting the velocity reference frame and correcting for Doppler motions
4. Exporting to UVFITS
5. Removing the intermediate MS

The intermediate MS is created using mstransform, with `keepflags=False, regridms=True, outframe='LSRK'`. Source and spectral window identification is done using keywords `spw` and `field`, and an appropriate rest frequency is specified (in MHz) using `restfreq`. Finally, exportuvfits is used on the simple intermediate MS. [rgb]1,0,0IMAGER provides to CASA a tool named casagildas() that scans the content of the Measurement Set (using listobs() to automatically do this on all combinations of spectral windows and sources.