Fig 2. Diagram of a correlated network of networks according to parameters α and β.

Hubs (red nodes) and non-hubs nodes (blue nodes) can have inlinks (solid lines) and outlinks (dotted lines). When α > 0, hubs are more likely to have many outlinks whereas when α < 0, non-hub nodes are more likely to have outlinks. When β > 0, hubs prefer to connect with other hubs in a different network but when β < 0, hubs in one network prefer to connect to non-hub nodes in a different network.