FIG 5A illustrates {TAIL ~ the intensity} of the received light as a function of {HEAD ~ time} 
FIG 5A illustrates { TAIL ~ the intensity } of the received light as a function of { HEAD ~ time }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD