Boxplot showing the distribution of the ratio between the length of the ulna and the length of the humerus
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 forelimb
of Brachylophosaurus canadensis (MOR 794). Grey horizontal lines delimit character states.