Define and/or plot the support inside which to search for CLEAN components. The support can be defined through a mask (see /MASK option) or a polygon, depending on the selected options. The /PLOT option can then be used to plot it.
A polygon stored in a file, or in a Sic variable (/VARIABLE option), can be loaded as the polygon support.
See also the [ADVANCED\]MASK command for a complementary way of defining supports, in particular 3-D supports.