This toner mass information, together with certain toner constants and known parameters, is used by the logic and control unit to calculate {HEAD ~ the toners charge} to {TAIL ~ mass ratio} 
to
This toner mass information , together with certain toner constants and known parameters , is used by the logic and control unit to calculate { HEAD ~ the toners charge } to { TAIL ~ mass ratio }
OTH OTH OTH OTH 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