SDI
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SDI

            CLEAN  [FirstPlane  [LastPlane]]  [/PLOT  Clean|Residu]  [/FLUX Fmin
        Fmax] [/QUERY] [/RESTART [File]]

        with METHOD = SDI

        Perform a Steer-Dewdney-Ito CLEAN. This clean method selects an ensemble
        of  clean  components and remove them at once using FFTs.  It works best
        for extended sources and UV coverages with short  spacings.  In  such  a
        case,  it  may avoid the "ringing" features which appear using the CLARK
        or HOGBOM techniques. In mosaic mode  (see  command  MOSAIC),  a  mosaic
        clean is performed.

        SDI is very sensitive to the selected support (see MASK and SUPPORT com-
        mands), especially when the dirty beam sidelobes are significant.