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Fig. 3. Plot of heart rates (fH) of mammals at rest vs
body mass Mb (data taken from
Brody, 1945). The regression
lines are fitted to the average of the logarithms for every 0.1 log unit
interval of mass, but both the average (squares) and raw data (bars) are shown
in the plots. The slope is -0.251 (P<0.0001, N=17, 95%
CI: -0.221, -0.281), which clearly includes -1/4 but excludes -1/3. Figure
taken from Savage et al.
(2004b) with permission.