{TAIL ~ The edge} is defined by {HEAD ~ the metallization line} underlying the first silicon nitride layer 
{ TAIL ~ The edge } is defined by { HEAD ~ the metallization line } underlying the first silicon nitride layer
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH