The photodiodes are responsive to {TAIL ~ illumination} to produce a photocurrent, wherein {HEAD ~ a total current} flowing through each photodiode includes the dark current and the photocurrent 
The photodiodes are responsive to { TAIL ~ illumination } to produce a photocurrent , wherein { HEAD ~ a total current } flowing through each photodiode includes the dark current and the photocurrent
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH