FIG. 2.

(a) Circular representation of the global mobility network with vertex colors and size corresponding to its strength $k_i^W$. (b) Normalized weight distribution $\mathcal{P}\left(W\right)\sim W^{-{\gamma }_w}$ with scaling exponent ${\gamma }_w=3.60\pm 0.14$. Inset: Unweighted degree distribution $\mathcal{P}\left(k\right)\sim k^{-{\gamma }_k}$ with scaling exponent ${\gamma }_k=1.79\pm 0.10$. Scaling exponents are obtained using the method presented in Ref. [27].