{HEAD ~ The controller} 52 uses {TAIL ~ this approximate average} to control the magnitude of power to both electrodes 
{ HEAD ~ The controller } 52 uses { TAIL ~ this approximate average } to control the magnitude of power to both electrodes
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH