A two color reading system includes binary encoders for {HEAD ~ signals} of {TAIL ~ wide and narrow wavelength ranges} 
A two color reading system includes binary encoders for { HEAD ~ signals } of { TAIL ~ wide and narrow wavelength ranges }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL