CLEAN_ARES

    This is the minimal flux in the dirty map that the program will consider  as
    significant.  Alternatively, the threshold can be specified as a fraction of
    the  peak  flux using CLEAN_FRES.  Once this level has been reached the pro-
    gram stops subtracting, and starts the restoration phase.  The unit for this
    parameter is the map unit (typically Jy/Beam).  The parameter should usually
    be of the order of magnitude of the expected noise in the clean map.

    If 0, CLEAN_FRES will be used instead. If all of CLEAN_NITER, CLEAN_ARES and
    CLEAN_FRES are 0, an absolute residual equal to the noise level will be used
    for CLEAN_ARES.

    Short form is ARES.

    This may be overseded by the /ARES option which imposes a  limit  per  plane
    through an array of values.