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