{HEAD ~ a second opposing electrode} arranged in {TAIL ~ opposition} to the second voltage application electrode; and 
arranged in
{ HEAD ~ a second opposing electrode } arranged in { TAIL ~ opposition } to the second voltage application electrode ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH