Changing {TAIL ~ the area} upon which {HEAD ~ AGC adjustments} are applied permits better scene selection according to the present invention 
upon are applied
Changing { TAIL ~ the area } upon which { HEAD ~ AGC adjustments } are applied permits better scene selection according to the present invention
OTH TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH