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