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