Figure 6 in The killer's toolkit: remarkable adaptations in the canine teeth of mammalian carnivores

Figure 6. Differences between upper and lower canine teeth of the same individual. A, canine tooth length based on a phylogenetic generalized least squares (PGLS) regression of log10(upper and lower canine tooth length). The dashed black line indicated a 1:1 relationship. B, plot of the differences in robustness [principal component 1 (PC1)] and curvature (PC2) between upper and lower canines; differences in PC scores were calculated as: (lower canine PC score) minus (upper canine PC score).