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. 2020 Apr 22;10:6793. doi: 10.1038/s41598-020-63739-5

Figure 4.

Figure 4

PCA of the mandibular shape variables (only the two first PCs are shown) including both the extant and fossil samples. The mean shape was warped to represent the variation along the two-plotted PC axes using the thin-plate spline method. H: Hard food eater; S: Soft food eater; ?: Fossil.