The first and second sub gates of {HEAD ~ the second gate} are separated by {TAIL ~ a second intergate dielectric layer} 
The first and second sub gates of { HEAD ~ the second gate } are separated by { TAIL ~ a second intergate dielectric layer }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL