Boxplot showing the distribution of the ratio between the dorsoventral depth of the flange and the minimum
depth of the caudal constriction of the jugal) . The inserted smaller graph shows the Bayesian information criterion (BIC) for various numbers of
clusters in which the data can be classified. The photograph how the two variables of this raio were measured, exemplified in a jugal of
Brachylophosaurus canadensis (MOR1071-7-6-98-79).