As total gain is increased beyond {HEAD ~ the user} established {TAIL ~ maximum shutter gain value}, the incremental change in gain is performed in substantially the same gain step sizes 
established
As total gain is increased beyond { HEAD ~ the user } established { TAIL ~ maximum shutter gain value } , the incremental change in gain is performed in substantially the same gain step sizes
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH