Quantification of the distribution of centers of mass across the anterior-posterior (AP) axis (left) and medial-lateral (ML) axis (right) (note 24° head rotation). Horizontal lines represent the median of the distribution, boxes delineate upper and lower quartiles, and whiskers range from minimum to maximum data points excluding outliers; tested for significance using independent t tests, Bonferroni-corrected for multiple comparisons (∗∗∗p< 0.001). See alsoFigures S1–S4andTable S1.