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. 2016 Jul 6;16(7):1045. doi: 10.3390/s16071045

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© 2016 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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The angle $ϕ_{MPJ}$ of the human index finger. (a) One click and (b) double click. Blue crosses and purple lines are the experimental data and its fundamental harmonics, respectively.