{HEAD ~ Each receiver} includes a light collection and delivery system, a position sensitive detector, and an associated ratio metric signal processor, or {TAIL ~ similar means} for extraction of height and intensity information or data by triangulation 
includes
{ HEAD ~ Each receiver } includes a light collection and delivery system , a position sensitive detector , and an associated ratio metric signal processor , or { TAIL ~ similar means } for extraction of height and intensity information or data by triangulation
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH