The second integrated frame is divided by {HEAD ~ the first integrated frame} to yield {TAIL ~ a range coded pixel intensity image} 
The second integrated frame is divided by { HEAD ~ the first integrated frame } to yield { TAIL ~ a range coded pixel intensity image }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL