The apparatus 1 in which said predetermined potential is between 200 V and 600 V and said alternating potential has {HEAD ~ an amplitude} comprised between {TAIL ~ 200 V} and 600 V peak and a frequency between 100 Hz and 1500 Hz 
comprised between
The apparatus 1 in which said predetermined potential is between 200 V and 600 V and said alternating potential has { HEAD ~ an amplitude } comprised between { TAIL ~ 200 V } and 600 V peak and a frequency between 100 Hz and 1500 Hz
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH