The increased base width of the NPN transistor 39 results in {HEAD ~ the transistor} having a reduced emitter efficiency, {TAIL ~ a smaller base transport factor}, and less sensitivity to base width modulation, which are desirable in a parasitic BJT transistor 
The increased base width of the NPN transistor 39 results in { HEAD ~ the transistor } having a reduced emitter efficiency , { TAIL ~ a smaller base transport factor } , and less sensitivity to base width modulation , which are desirable in a parasitic BJT transistor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH