Scatterplot of principal components 3 and 4 of footprint shape. The principal components are visualized by footprint shapes along the two corresponding axes. Individuals with a low score along PC 3 have a long and narrow hallux relative to the other toes (“Egyptian foot”), whereas individuals with a high score have a long second toe relative to the hallux (“Greek foot”). PC 4 mainly reflects the relative length of the forefoot. The symbol type corresponds to the geographical origin of the individuals.