Apply Hanning smoothing on the CORRECTED column. The output will be saved into the DATA column.

hanningsmooth(vis='example.ms', outputvis='test.ms', datacolumn='corrected')

Apply Hanning smoothing on all visibility columns of the Multi-MS. In this case, if CASA is started with mpicasa, the processing will happen in parallel.

hanningsmooth(vis='example.mms', outputvis='test.mms') --> default

hanningsmooth(vis='example.mms', outputvis='test.mms', datacolumn='all', keepmms=True) --> set the parameters explicitly