varying either said partial pressure of reactants or said coolant flow rate to maintain said sensed temperature to said {HEAD ~ highest temperature level} at said {TAIL ~ outlet side} 
at
varying either said partial pressure of reactants or said coolant flow rate to maintain said sensed temperature to said { HEAD ~ highest temperature level } at said { TAIL ~ outlet side }
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 HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL