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