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