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. 2017 Nov 13;18:215. doi: 10.1186/s13059-017-1346-4

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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. 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 — Introgression from mexicana into maize landraces. Loess regression of $\hat{f_{d}}$ is plotted for all five populations on a chromosome 3 and b chromosome 4. Each plot highlights a single population, with other populations shown in gray. The Mexican lowlands population is used as a reference and thus not plotted. No significant introgression was detected in the South American lowlands or the Andes, and loess regressions for these populations are only shown as gray lines. The statistic $\hat{f_{d}}$ was calculated based on the tree in which P2 is varied across populations. mex mexicana, Trip Tripsacum