Landmark-based analysis of the mandible shape of hard vs. soft food eaters. A. Morphological variation in the space of the first and third principal components of the mandible shape analysis. Hard food eaters: blue diamonds; soft food eaters: red circles. B and C. Visualization of the deformation associated with the two axes. Deformation has been magnified by taking extreme values along the axes: −0.1 (in blue)/+0.1 (in red). B. Deformation along PC1. C. Deformation along PC3.