CLEAN_SIDELOBE

    Minimal  relative  intensity to consider for fitting the syntheized beam
    to obtain the Clean beam parameters (BEAM_FITTED variable) when 0.   The
    default is 0.35.

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