{HEAD ~ The sensor} includes a light source transmitter and {TAIL ~ a receiver} sensitive to the radiation emitted by the transmitter to be located on a diametrically opposite surface area portion of the body protruding part 
includes
{ HEAD ~ The sensor } includes a light source transmitter and { TAIL ~ a receiver } sensitive to the radiation emitted by the transmitter to be located on a diametrically opposite surface area portion of the body protruding part
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH