SPECTRAL_CLEAN DUAL

          [BUNDLES\]SPECTRAL_CLEAN DUAL NSmooth

    In DUAL mode, SPECTRAL_CLEAN cleans a (spectrally) smoothed version  of  the
    data  cube,  and the difference between this smooth version and the original
    ones. The two Clean component tables are then merged to  restore  the  final
    image using UV_RESTORE.

    NSmooth is the number of channels being smoothed together.

    The  DUAL  methods involves Cleaning two data cubes, so is a somewhat slower
    than a simple CLEAN.  SPCLEAN%MEMORY indicates whether intermediate  results
    are  kept  in memory (faster) or on temporary files (slower, but allowing to
    work on larger files).

    Mode MULTI should in general be preferred, but does not  include  the  final
    UV_RESTORE.