{HEAD ~ One switch} couples to {TAIL ~ each sensing circuit} and to the column timing switch control circuit 
{ HEAD ~ One switch } couples to { TAIL ~ each sensing circuit } and to the column timing switch control circuit
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH