Fig. 1.

Schematic representation of a line-like, hierarchically tree structure and star-like network. Each network type has 7 nodes and 6 edges. Leaf nodes, the blue nodes in the figure, are nodes that only have one edge and the diameter is the length of the path between the two nodes that are furthest apart. The orange nodes in the figure have a high betweenness centrality. (A) Line-like network: few leaf nodes + long diameter, (B) hierarchical tree structure, (C) star-like network: many leaf nodes + short diameter + a central node with a high betweenness centrality.