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