FIT BEAM_SIZE

    BEAM_SIZE is a Real array of size 3 containing the user-specified values for
    the Clean beam size, with BEAM_SIZE[1] the Major axis, BEAM_SIZE[2] the  Mi-
    nor  axis  (both in arcsec) and BEAM_SIZE[3] the Position angle (in degrees,
    North towards East).

    If BEAM_SIZE[1] and BEAM_SIZE[2] are 0, the CLEAN or FIT commands  will  de-
    termine  the  Clean  beam size (available in variable BEAM_FITTED similar to
    BEAM_SIZE) by adjusting the dirty beam main peak.

    If only one of BEAM_SIZE[1] and BEAM_SIZE[2] is non zero, it will be used as
    the Clean beam size for a circular beam.

    If both are non zero, BEAM_SIZE  totally  specifies  the  Clean  beam  size.
    BEAM_FITTED is thus set to the BEAM_SIZE values when used.