| http://www.w3.org/ns/prov#value | - It is worth noticing that, in this embodiment, the voltage VCZX of the cathode electrodes 16 within the second cathode region 14ZX, which is away from the region connected to the power supply 11, may be affected more seriously by the voltage drop issue caused by properties such as shape and resistivity of the cathode electrode 16.
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