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. 2019 Jul 31;19(15):3359. doi: 10.3390/s19153359

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© 2019 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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Correction process of X-axis of discrete point frame. Virtual $Vec_X$ is the uncorrected X-axis of the frame. Real $Vec_X$ is the corrected X-axis of the frame.