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.