           the phase values. The latter method requires that
                   RPMMAP was called with a Hanning window, otherwise it
                   produces wrong results! Default is 'Hann5'
                   'Synch' tells this function that the map is from a
                   synchronuously sampled map, where the F axis is in
                   orders. Simple peak picking is used, as there should be
                   no smearing after the synchronuous sampling.
       FilterL     If given, each ord