Fig. 1

Linear distance correlations and scaling. Plots of two randomly chosen linear distances calculated from our CC founder and F1 sample illustrating the change in correlation direction after scaling measures to overall skull size (centroid size). Plots of raw linear distance a L15–R22 and b R32–R2 versus skull centroid size. Plots of linear distance L15–R22 versus R32-R2 c before and d after Procrustes superimposition-based scaling (based on centroid size). e Correlation coefficients from 10,000 randomly permuted linear distance pairs calculated from raw linear distances (left) and after (right) Procrustes superimposition and scaling