Results of Principal Coordinates Analysis of landmark coordinate data collected from 3dMD images. Red circles represent boys with autism spectrum disorder (ASD), and blue diamonds represent typically developing boys. (A) Plot of eigenscores for the first two principal axes. Axis 1 accounts for 31.09% of the variance within the entire sample, and axis 2 accounts for 11.33% of the variance. (B) Plot of eigenscores for the second and third principal axes. Axis 3 accounts for 9.44% of the sample variance.