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. 2016 Sep 21;16:194. doi: 10.1186/s12862-016-0758-1

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© The Author(s). 2016

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Coalescent-based chronogram (*BEAST maximum clade credibility tree) of the alpestris species group extracted from the global five-gene species tree, with ancestral altitudes reconstructed using the REML method. The altitudes and the color gradient are indicated as in Fig. 5