{TAIL ~ Particulates} in the trap are ignited and burnt off by exhaust gas {HEAD ~ whose temperature} has been raised by the electric heater 
{ TAIL ~ Particulates } in the trap are ignited and burnt off by exhaust gas { HEAD ~ whose temperature } has been raised by the electric heater
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH