The upper curve of FIG 3 illustrates {HEAD ~ current voltage characteristics} of {TAIL ~ a typical positive temperature coefficient thermistor} 
The upper curve of FIG 3 illustrates { HEAD ~ current voltage characteristics } of { TAIL ~ a typical positive temperature coefficient thermistor }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL