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. 2019 Dec 20;20(1):52. doi: 10.3390/s20010052

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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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Distance from plane $ρ_{C_{i}}^{'}$ , to plane $ρ_{L_{i}}$ .