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. 2015 Sep 30;15(10):25385–25398. doi: 10.3390/s151025385

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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SPR curve-fitting results measured in air (black dot line: SPR curve, red solid line: fitting curve): (a) Asymmetric fitted SPR curve. (b) 24th-order polynomial regression-fitted SPR curve. (c) Sigmoid-asymmetric fitted SPR curve.