{TAIL ~ A thick insulator region} is formed on {HEAD ~ a portion} of the drift region at the face 
{ TAIL ~ A thick insulator region } is formed on { HEAD ~ a portion } of the drift region at the face
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH