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. 2016 May 20;16:110. doi: 10.1186/s12862-016-0673-5

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© Carter and Worthington. 2016

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. 4 — Lower molar proportions for modern humans polymorphic for M ₃ agenesis (n=66). Points are individual specimen molar proportions. Dashed line indicates DIC model’s predicted relationship between molar proportion ratios: M ₃/M ₁=2(M ₂/M ₁)−1. White regions are locations in molar proportion morphospace consistent with the DIC model: a high a/i region where M ₁<M ₂<M ₃ and a low a/i region where M ₁>M ₂>M ₃