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. 2019 Jan 16;10:246. doi: 10.1038/s41467-018-08089-7

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© The Author(s) 2019

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. 1 — Increase of Neanderthal ancestry in Asians compared to Europeans. The introgression amount is calculated by the F4 ratio test. F4 (Outgroup, Altai; Europeans, X)/F4(Outgroup, Altai; Africa, Vindjia) where Outgroup can be either Denisova or Ancestral alleles from 1000 Genome and X is either East Asian (ASN), Indian Tribal (IND) or Andamanese (AND). In the y axis to make it short we only mention F4(Outgroup, X) as the other populations remain constant for all the F4 ratio tests. In the x axis we have the amount of F4 ratio and the standard error is denoted by bars (standard error was calculated by Jackknife method using 555 blocks). The blue line signifies 0 value for F4 ratio test