An emitter and {HEAD ~ an extrinsic base layer} are formed in {TAIL ~ respective contacting relationships} with the first and second portions of the intrinsic base layer 
are formed in
An emitter and { HEAD ~ an extrinsic base layer } are formed in { TAIL ~ respective contacting relationships } with the first and second portions of the intrinsic base layer
OTH OTH OTH HEAD 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