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