The control system adjusts {HEAD ~ the voltage} across {TAIL ~ those electrodes} based on the discharge counter values 
across
The control system adjusts { HEAD ~ the voltage } across { TAIL ~ those electrodes } based on the discharge counter values
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH