__init__ (
        self,
        fn,
        polorder=( 1, 1 ),
        verbose=1,
        rotpoly=0,
        )

__repr__ ( self )

fit (
        self,
        polorder,
        rotpoly,
        )

getshifts ( self,  fn )

pols ( self )

prms0 ( self )

prms1 ( self )

rms0 ( self )

rms1 ( self )