The first fixed electrode has {TAIL ~ a central angle} of 180°, for example, and is split into a first fixed split electrode member having a central angle of 60° and a second fixed split electrode member having a central angle of {HEAD ~ 120°} 
The first fixed electrode has { TAIL ~ a central angle } of 180 ° , for example , and is split into a first fixed split electrode member having a central angle of 60 ° and a second fixed split electrode member having a central angle of { HEAD ~ 120 ° }
OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD