The vertically integrated crossbar geometry of {TAIL ~ the three dimensional crossbar array} may include multiple stacked horizontal metal lines and {HEAD ~ vertical via lines} 
The vertically integrated crossbar geometry of { TAIL ~ the three dimensional crossbar array } may include multiple stacked horizontal metal lines and { HEAD ~ vertical via lines }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD