determining {HEAD ~ a total amount} of {TAIL ~ fuel} required to raise the temperature of exhaust above a regeneration temperature based on the determined flow rate and the determined temperature; and 
of
determining { HEAD ~ a total amount } of { TAIL ~ fuel } required to raise the temperature of exhaust above a regeneration temperature based on the determined flow rate and the determined temperature ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH