Receiving {HEAD ~ each vignetted light field} at {TAIL ~ the associated each vignetted light sensor}, and 
at
Receiving { HEAD ~ each vignetted light field } at { TAIL ~ the associated each vignetted light sensor } , and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH