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