{HEAD ~ This body} spaces a source region of {TAIL ~ the second conductivity type} from the drift region 
{ HEAD ~ This body } spaces a source region of { TAIL ~ the second conductivity type } from the drift region
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH