Apparatus 1, in which the inlet is at {HEAD ~ a potential} in {TAIL ~ the range} 0 1 KV 
in
Apparatus 1 , in which the inlet is at { HEAD ~ a potential } in { TAIL ~ the range } 0 1 KV
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH