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