{HEAD ~ Each light sensor} generates {TAIL ~ a measurable electrical quantity} responsive to the associated vignetted light field, and the collective measurable electrical quantities are responsive to incoming light field 
generates
{ HEAD ~ Each light sensor } generates { TAIL ~ a measurable electrical quantity } responsive to the associated vignetted light field , and the collective measurable electrical quantities are responsive to incoming light field
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH