Allometric scaling.

A: Plot of the logarithmically binned set of values of branch size, A, and cumulative branch size, C, for the interspecific (empty squares) and intraspecific (solid circles) data sets considered. The line corresponds to a power law C∼A^η, with the exponent given by the best fit through all data, η = 1.44. The inset shows probability distributions of the values of η fitted to each individual tree (left: interspecific, right: intraspecific data sets) illustrating the small dispersion in the values. B: Plot of the logarithmically binned set of values of C as a function of A for the interspecific data, normalized by the prediction from the ERM model (the horizontal line). Data systematically deviate from ERM, especially for large size A.