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  maxi-
    mum  sidelobe level to perform a good Gaussian fit. Some particularly bad UV
    coverage may not allow any good fit at all, however.