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