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