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