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