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