The silicon underneath {TAIL ~ the polysilicon gates} 320 a and {HEAD ~ 320 b} is not removed 
The silicon underneath { TAIL ~ the polysilicon gates } 320 a and { HEAD ~ 320 b } is not removed
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH