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