{TAIL ~ The apparatus} 1, further comprising a switching element operable to selectively connect the surface region to {HEAD ~ a source} of potential that is at a reset level 
{ TAIL ~ The apparatus } 1 , further comprising a switching element operable to selectively connect the surface region to { HEAD ~ a source } of potential that is at a reset level
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH