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Attack vulnerability of the SF networks. The WWW (η = 2.0; ■) and the artificial directed SF network with η = 2.2 (□), the Internet (η = 2.0; ●), and the artificial undirected SF network with η = 2.2 (○): changes in network diameter (a and c) and the relative size of the largest cluster (b and d) are shown as a function of f, the fraction of removed vertices measured in percent (%).
