a plurality of {TAIL ~ photodiodes} integrated in {HEAD ~ said substrate}, each of said photodiodes having a light sensitive region completely disposed only at said surface 
a plurality of { TAIL ~ photodiodes } integrated in { HEAD ~ said substrate } , each of said photodiodes having a light sensitive region completely disposed only at said surface
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH