{HEAD ~ an anode} with {TAIL ~ positive electric potential}; anode is located close to a gas distributing system, and it is placed in a discharge channel external wall between two cylindrical external dielectric walls 
with
{ HEAD ~ an anode } with { TAIL ~ positive electric potential } ; anode is located close to a gas distributing system , and it is placed in a discharge channel external wall between two cylindrical external dielectric walls
HEAD HEAD HEAD HEAD HEAD HEAD REL 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