{TAIL ~ The system} 1, wherein a ratio of {HEAD ~ plugged area} to the total cell area of the flow through honeycomb substrate is less than 45% 
{ TAIL ~ The system } 1 , wherein a ratio of { HEAD ~ plugged area } to the total cell area of the flow through honeycomb substrate is less than 45 %
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH