Fig. 4
From: New insights into the first cervical vertebrae of Otavipithecus and Nacholapithecus

Quantitative analysis of shape variation in complete atlases. Principal component analysis (PCA) of the Procrustes-registered shape coordinates of the complete atlas morphology calculated for GSN BA 104’91 and comparative extant primates for PC1, PC2 (a) and PC3 (b). Shapes at the extremes of the axes illustrate morphological variation trends along each component in superior and posterior views. Figure generated with RStudio 1.4.1106.