Further, an end of each of the active electrodes, {HEAD ~ the end} being positioned at the first side, is located closer to {TAIL ~ the second side} from a point on the inclined surface at the same depth as a lower end of the active electrode 
Further , an end of each of the active electrodes , { HEAD ~ the end } being positioned at the first side , is located closer to { TAIL ~ the second side } from a point on the inclined surface at the same depth as a lower end of the active electrode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH