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 {TAIL ~ a lower end} of 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 { TAIL ~ a lower end } of 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 TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH