In {TAIL ~ one form} the detected photoluminescence is compared to detected scattered excitation light to determine {HEAD ~ temperature} 
In { TAIL ~ one form } the detected photoluminescence is compared to detected scattered excitation light to determine { HEAD ~ temperature }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD