{HEAD ~ The anodes} of all of the extraction diodes are connected together at {TAIL ~ a common anode contact}, and a voltage is applied across the extraction diodes by connecting a voltage source to the common anode contact so that the extraction diodes are reversed biased and thus block current flow 
are connected together at
{ HEAD ~ The anodes } of all of the extraction diodes are connected together at { TAIL ~ a common anode contact } , and a voltage is applied across the extraction diodes by connecting a voltage source to the common anode contact so that the extraction diodes are reversed biased and thus block current flow
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH