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Use the mask defined by READ MASK or by the MASK command as the clean support. This does not suppress the current polygon: it can be re-instated by a simple SUPPORT command with no argument.
The Mask can be a 3-D array: CLEAN will find out which mask plane must be used for each spectral channel.
Caution: [CLEAN\]READ MASK and [ADVANCED\]MASK command do not perform an implicit SUPPORT /MASK command. Only the ADVANCED\MASK USE command does it explicitely.