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Relationships between phenotypic variability for four traits (expressed as CV, corrected for climate) from male skulls and distance from the putative African origin (represented by the centroid of locations of origins). The traits are: (a) Lambda-opisthion chord (OCC), (b) Nasion prosthion height (NPH), (c) Nasal height (NLH), and (d) Zygomaxillary subtense (SSS).
