{HEAD ~ first voltage source} connected across {TAIL ~ each} of said photodiodes, biasing each of said photodiodes; and 
connected across
{ HEAD ~ first voltage source } connected across { TAIL ~ each } of said photodiodes , biasing each of said photodiodes ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH