To provide a fine tuning of the D.C. restoration function, a reference strip of {HEAD ~ known reflectivity} is provided along a crosstrack edge of {TAIL ~ the platen surface} 
To provide a fine tuning of the D.C. restoration function , a reference strip of { HEAD ~ known reflectivity } is provided along a crosstrack edge of { TAIL ~ the platen surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL