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. 2018 Sep 17;18(9):3136. doi: 10.3390/s18093136

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Illustrations showing how the parameters were measured. R_p response for $ψ_{0}$ of 0 V (solid black curve) and R_p response for $ψ_{0}$ greater than 0 V (solid red curve).