{HEAD ~ An electrical connection} is provided to opposite ends of the cathode through {TAIL ~ two or more low resistance resistors} with high temperature coefficients of resistance 
{ HEAD ~ An electrical connection } is provided to opposite ends of the cathode through { TAIL ~ two or more low resistance resistors } with high temperature coefficients of resistance
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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