If {HEAD ~ the catalyst temperature} is above {TAIL ~ the first temperature threshold T1} at 202, then the routine proceeds to 204 
is above
If { HEAD ~ the catalyst temperature } is above { TAIL ~ the first temperature threshold T1 } at 202 , then the routine proceeds to 204
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH