Further definition of the produced line of light, or scan line, is provided by {HEAD ~ non parallel sides} which extend between {TAIL ~ the reflective surfaces} 
Further definition of the produced line of light , or scan line , is provided by { HEAD ~ non parallel sides } which extend between { TAIL ~ the reflective surfaces }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL