{HEAD ~ A voltage divider} is connected between {TAIL ~ the negative side} or cathode and ground and an intermediate point on the divider is connected to a focusing electrode in the x ray tube for providing a focusing bias voltage 
{ HEAD ~ A voltage divider } is connected between { TAIL ~ the negative side } or cathode and ground and an intermediate point on the divider is connected to a focusing electrode in the x ray tube for providing a focusing bias voltage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL 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