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. 2019 Aug 21;5(8):eaav7913. doi: 10.1126/sciadv.aav7913

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2 — Whiskers show the lowest datum within 1.5 interquartile range (IQR) of the lower quartile and the highest datum within 1.5 IQR of the upper quartile. Outliers are shown as circles. For stem anthropoids, stem platyrrhines, and stem catarrhines, individual data points rather than the box and whisker are shown. PGLS regression for all anthropoids [x, ln(body mass); y, ln(brain weight); y = 0.50x − 0.87, t = 12.22, and P < 0.001) was used for calculating the PEQs. The PEQs of Dryopithecus, Australopithecus, Paranthropus, and Homo are much higher than in other anthropoids, shown as outliers.