The integrity of a beam of light may be compromised by contamination from other light beams giving {HEAD ~ rise} to {TAIL ~ “cross talk}” 
to
The integrity of a beam of light may be compromised by contamination from other light beams giving { HEAD ~ rise } to { TAIL ~ “ cross talk } ”
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH