In the present case {HEAD ~ neutral electrode} 10 is subdivided into {TAIL ~ two partial electrodes} 12 and 14 
is subdivided into
In the present case { HEAD ~ neutral electrode } 10 is subdivided into { TAIL ~ two partial electrodes } 12 and 14
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH