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