FIG. 2.

Mean spreading efficiency $M$ of nodes as classified by their degree $k$ (black squares) or their node strength s (red circles) in nine real-world networks. As the node strengths are real numbers instead of integers, data are grouped in intervals of size unity. The corresponding average spreading efficiency and node strength in each interval are displayed, starting from the minimal strength. The real-world networks are (a) CA-Hep, (b) Astro, (c) Emailcontact, (d) PGP, (e) Blog, (f) AS, (g) Router, (h) Hamster, and (i) Netsci.