KEPLER /MASK

        [BUNDLES\]KEPLER /MASK [File [Threshold]] [/VSYSTEM Value]  [/VELOCITY R
    function(R)]

      (Experimental)

      Generate an approximate spatial mask for further use,  e.g.  in  CLEAN  or
    other masking operations. The brightness is assumed to decrease with radius,
    and  a  local line width of 0.3 km/s is assumed to derive the channel-depen-
    dent mask. Convolution by the current Clean beam is performed.

      If a File argument is present, the resulting mask data cube is  stored  in
    File (with default extension

      If present, Threshold (in range [0,1]) indicates that pixels below the ap-
    parent  peak  brightness times the Threshold should be out of the mask (i.e.
    have a value 0), the others in the mask (a value 1).

      If Threshold is not present, the mask values are just taken "as is", with-
    out being re-mapped to a 0,1 mask. A simple SIC formula can be used to  con-
    vert them to a 0,1 mask later.