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SPECIFY UNIT 

        SPECIFY UNIT NewBrightnessUnit /FOR SicVariable
    Change data surface brightness unit to  the  desired  value,  rescaling  the
    data, the min, max, rms and noise using the proper scale factor derived from
    the data header.

    Recognised  units are : K, JY/BEAM, JY/PIXEL, MJY/STERADIA, MJY/STR.  If the
    input data unit is not one of these, nothing happens.