Next, a controller receives {HEAD ~ a signal} that indicates {TAIL ~ the actual temperature} of the heating element along with an indication of the desired temperature 
indicates
Next , a controller receives { HEAD ~ a signal } that indicates { TAIL ~ the actual temperature } of the heating element along with an indication of the desired temperature
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH