{TAIL ~ a common anode contact} at which {HEAD ~ the respective anodes} of all of said extraction diodes are connected together 
at
{ TAIL ~ a common anode contact } at which { HEAD ~ the respective anodes } of all of said extraction diodes are connected together
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH