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. 2018 Jun 28;9:2518. doi: 10.1038/s41467-018-04963-6

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Observed and simulated migrant tract length distributions in the Atlantic and Mediterranean populations. Observed distributions (gray) of migrant tract length are compared with simulated distributions (colored) under the post-glacial secondary contact scenario illustrated in the top-right corner³¹. The abundance of introgressed tracts as a function of their length is represented for observed vs. simulated data in the Atlantic (dark gray vs. red circles, showing tracts of Mediterranean origin) and Mediterranean populations (light gray vs. yellow circles, showing tracts of Atlantic origin)