A contact region between the via and {HEAD ~ the section} of the metal layer may define {TAIL ~ a crossbar array} 
A contact region between the via and { HEAD ~ the section } of the metal layer may define { TAIL ~ a crossbar array }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL