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