Further, {HEAD ~ an end} of {TAIL ~ 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 the active electrode 
of
Further , { HEAD ~ an end } of { TAIL ~ 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 the active electrode
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL 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 OTH