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Extended Data Fig. 9 | Summary of the slope estimates obtained from
phylogenetic generalized least squares with the Ericson and the Hackett
backbone tree sets, containing 1,000 trees each. a, Ericson backbone tree set.
b, Hackett backbone tree set. The x axes represent the estimated slope values,
and the y axes represent the number of the tree sampled from the entire set of
1,000 trees. Dots signify the actual slope estimate, and grey bars visualize the
s.e. of the slope estimates. The blue dashed line is the slope value obtained from
ordinary least square regression, and the red dashed line represents the slope
of isometry. Results from the phylogenetic generalized least squares iterations
(n = 1,000) suggest the presence of negative allometry (slope < 1) in the relation
between eye socket and skull length (P < 0.001).