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