When the temperature is within a normal burning range, the elapsed time that {HEAD ~ the temperature} remains within such range is stored as a first count whose magnitude is proportional to {TAIL ~ the accumulation} of particulates 
When the temperature is within a normal burning range , the elapsed time that { HEAD ~ the temperature } remains within such range is stored as a first count whose magnitude is proportional to { TAIL ~ the accumulation } of particulates
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH