applying {HEAD ~ a voltage} across {TAIL ~ each extraction diode} for operating each extraction diode only reverse biased and electrically isolating each of said photodiodes 
across
applying { HEAD ~ a voltage } across { TAIL ~ each extraction diode } for operating each extraction diode only reverse biased and electrically isolating each of said photodiodes
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH