SUPPORT /MASK

        [CLEAN\]SUPPORT /MASK    or  [ADVANCED\]MASK USE

    Use the mask defined by READ MASK or by the MASK command as the  clean  sup-
    port. 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 im-
    plicit SUPPORT /MASK command. Only the ADVANCED\MASK USE command does it ex-
    plicitely.