FIT CLEAN_SIDELOBE

    Minimal  relative  intensity  to consider for fitting the syntheized beam to
    obtain the Clean beam parameters (BEAM_SIZE variable) when 0.   The  default
    is 0.30.

    In  case of poor UV coverage, CLEAN_SIDELOBE should be higher than the maxi-
    mum sidelobe level to perform a good Gaussian fit. Some particularly bad  UV
    coverage may not allow any good fit at all, however.