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. 2017 Dec 20;17:265. doi: 10.1186/s12862-017-1116-7

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© The Author(s). 2017

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. 2 — Graphical representation of the six scenarios for the three population groups. NE, northeast populations; NO, north populations; SO, south populations. A1 and A2 are two unknown (ghost) populations divided into two branches. Scenario 1, 2 and 3 correspond to possible evolutionary relationships among the three populations without admixture between any two of them. Scenario 4, 5 and 6 assume that one of the three populations is an admixture of two other populations