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H. erectus, triangles and orange convex hull; Neandertals, squares and red convex hull; H. heidelbergensis/rhodesiensis, dark red diamonds; present-day humans, light blue convex hull; H. sapiens fossils, circles and dark blue convex hulls for geologic age groups 1 to 3. Evolutionary trends of shape changes in archaic and modern individuals are shown as regressions on geologic age (arrows) (see fig. S2 for labels of fossil individuals).
