{TAIL ~ The igniter} 2 wherein {HEAD ~ said gap filler} has a relative permeability of not greater than 15 
{ TAIL ~ The igniter } 2 wherein { HEAD ~ said gap filler } has a relative permeability of not greater than 15
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH