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