{HEAD ~ Spatially resolved temperature data} are obtained through {TAIL ~ correlation} of the detected photoluminescence signal with location within the glass 
are obtained through
{ HEAD ~ Spatially resolved temperature data } are obtained through { TAIL ~ correlation } of the detected photoluminescence signal with location within the glass
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH