{TAIL ~ The DOC} 32 oxidizes {HEAD ~ the exhaust} based on the post combustion air/fuel ratio 
{ TAIL ~ The DOC } 32 oxidizes { HEAD ~ the exhaust } based on the post combustion air / fuel ratio
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH