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Fig. 3. Isometric scaling of independent contrast values for Odontomachus
species. OLS regressions of normalized independent contrast values (IC) for
body mass, jaw length and jaw mass against head width, with intercept set to
the origin. All have slopes that do not depart significantly from null
hypothesis of isometry for linear scaling (slope=1) or for mass scaling
(slope=3), as follows: jaw length: P=0.0053, slope=1.12, 95%
confidence interval for slope=0.61–1.63, r2=0.75;
jaw mass: P=0.0018 slope=3.26, 95% CI=2.07–4.45,
r2=0.82; body mass: P<0.001, slope=2.94, 95%
CI=2.03–3.85, r2=0.87.