removing {HEAD ~ the sacrificial emitter pedestal} to define an emitter window between the non conductive spacers and extending through the extrinsic base layer to {TAIL ~ the first portion} of the intrinsic base layer 
extending to
removing { HEAD ~ the sacrificial emitter pedestal } to define an emitter window between the non conductive spacers and extending through the extrinsic base layer to { TAIL ~ the first portion } of the intrinsic base layer
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH