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Log10/log10 plot of (A) total turbinal surface area (TTSA) against skull length, (B) respiratory surface area (RTSA) against body mass, and (C) respiratory surface area (RTSA) against chamber volume. Open squares, arctoids; solid circles, canids. Least-squares regression lines are shown for the total sample (red), arctoids (dashed) and canids (solid). See Table 1 for species codes and Table 2 for line equations and regression statistics.
