Circuit 50 comprises {HEAD ~ a photodiode} 52 with {TAIL ~ anode} 54 and cathode 56 and photodiode 58 with anode 60 and cathode 62 
with
Circuit 50 comprises { HEAD ~ a photodiode } 52 with { TAIL ~ anode } 54 and cathode 56 and photodiode 58 with anode 60 and cathode 62
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH