PRIMARY /APPLY

        [CLEAN\]PRIMARY [BeamSize] /APPLY Input Output [/TRUNCATE Fraction]

    Attenuate  the  data  in the Input data cube by the current primary beam and
    place the result in Output.  Input can be a 3-D SIC image variable  or  data
    file,  depending on the presence of a dot "." in the name. This also applies
    to Output. If the later is a file, it is created.  If it is a SIC  variable,
    it must exists and match in size the Input data.

    The primary beam is recomputed to match the Input data sampling if needed.