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