{HEAD ~ The reading structure} is external to the pixel array but may still be fabricated on {TAIL ~ the same CMOS chip} as the pixel array 
{ HEAD ~ The reading structure } is external to the pixel array but may still be fabricated on { TAIL ~ the same CMOS chip } as the pixel array
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH