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. 2018 Apr 27;18(5):1369. doi: 10.3390/s18051369

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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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Horizontal displacements estimated by GPS in mm with error ellipses at 99% confidence. (a) Period February–July 2008; (b) period March–July 2013; (c) period March 2013–August 2014; (d) period March 2013–September 2015; (e) period March 2013–September 2016.

Horizontal displacements estimated by GPS in mm with error ellipses at 99% confidence. (a) Period February–July 2008; (b) period March–July 2013; (c) period March 2013–August 2014; (d) period March 2013–September 2015; (e) period March 2013–September 2016.