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. 2017 Apr 14;24(16):14091–14103. doi: 10.1007/s11356-017-8944-2

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — Principal component analysis (PCA) and cluster analysis of REEs contents in analysed plant species collected from Area 1 and 2 (a and b) and Area 3 and 4 (c and d)