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. 2019 Apr 6;19(7):1642. doi: 10.3390/s19071642

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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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The WPEVs of different detecting points of the SJ2 group. (a) Detecting point 1, (b) Detecting point 2, (c) Detecting point 3, (d) Detecting point 4, (e) Detecting point 5, (f) Detecting point 6.