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