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