The improved signal restoring 15 wherein {TAIL ~ said reference region} is along a crosstrack edge of {HEAD ~ the platen} 
The improved signal restoring 15 wherein { TAIL ~ said reference region } is along a crosstrack edge of { HEAD ~ the platen }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD