In accordance with a preferred embodiment of the invention {HEAD ~ the phase information} of {TAIL ~ the intensity variations} at the sampling positions is used for compensating the respective phase offsets 
of
In accordance with a preferred embodiment of the invention { HEAD ~ the phase information } of { TAIL ~ the intensity variations } at the sampling positions is used for compensating the respective phase offsets
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH