The cell densities of the flow through honeycomb substrate 200 and the wall flow particulate filter 300 may or may not be the same, where {HEAD ~ cell density} is the number of channels per {TAIL ~ cross sectional area} of the honeycomb substrate 
The cell densities of the flow through honeycomb substrate 200 and the wall flow particulate filter 300 may or may not be the same , where { HEAD ~ cell density } is the number of channels per { TAIL ~ cross sectional area } of the honeycomb substrate
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH