The device 12, wherein the at least one of {TAIL ~ an integration interval} and the number of coherent passes are derived from {HEAD ~ a look up table} 
The device 12 , wherein the at least one of { TAIL ~ an integration interval } and the number of coherent passes are derived from { HEAD ~ a look up table }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD