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