Core-periphery structure at the two resolution levels, <i>G</i><sub>19×19</sub> and <i>G</i><sub>125×125</sub>.

<p>(a,c) Results found by the stochastic block model, where <i>γ</i><sub><i>c</i></sub> is the probability for a node to belong to the core. Core nodes, with <i>γ</i><sub><i>c</i></sub> > 0.5, are labeled with red dots. (b,d) Dendrograms showing the hierarchical decomposition of the networks based on the Girvan-Newman algorithm. The core nodes (labeled with red dots) are located towards the inside of the onion structure, while the periphery nodes (labeled with blue dots) are in the outer layers. (e) Graphical representation of the <i>G</i><sub>125×125</sub> network using a force directed layout. Core nodes are concentrated towards the center. For the lists of core areas at the two resolution levels, see <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.2002612#pbio.2002612.s013" target="_blank">S13 Fig</a>.</p>