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