{HEAD ~ a second conductive type high voltage} well, which is formed in {TAIL ~ the substrate} beneath the upper surface 
is formed in
{ HEAD ~ a second conductive type high voltage } well , which is formed in { TAIL ~ the substrate } beneath the upper surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH