Statistics on the topological features of the eight networks.

and denote the number of nodes and links. and are the average clustering coefficient and the density of the network, respectively. If a vertex has neighbours, edges could exist among the vertices within the neighbourhood. Thus, the local clustering coefficient for a network can be defined as [39], where denotes the neighbours of . is defined as . is defined as . is the modularity of the network defined as [26], where denotes a community which includes the vertice and if vertices and are connected and 0 otherwise and if and 0 otherwise. and denote the average degree and the average shortest distance.