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. 2014 Mar 24;9(1):140. doi: 10.1186/1556-276X-9-140

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Copyright © 2014 Wu et al.; licensee Springer.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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Current blockage histograms as a function of applied voltage at medium voltages. The histograms of time duration are fitted by exponential distribution. An exponential function of dwell time versus voltage is defined in the inset.