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Boxplot showing the distribution of the ratio between the distance from the acetabular margin to the distal border of the prepubic process and the distance from the dorsal margin of the iliac peduncle to the ventral border of the proximal postpubic shaft, for a sample of iguanodontoidean ornithopods. The inserted smaller graph shows the Bayesian information criterion (BIC) for various numbers of clusters in which the data can be classified. The photograph shows how the two variable of this ratio were measured, exemplified in a pubis of Bactrosaurus johnsoni (SBDE 95E5/43).

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