The overlap of {HEAD ~ the horizontal and vertical lines} may therefore be comparable to {TAIL ~ a memristor structure}, that is, a junction 
The overlap of { HEAD ~ the horizontal and vertical lines } may therefore be comparable to { TAIL ~ a memristor structure } , that is , a junction
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH