Fig. 5

Left: Heatmap of DGCD-129 distance matrix for the reduced networks. Rows and columns are primarily ordered by service class, and then by year from 1995 to 2012. The colorbar shows that the colder the colour, the smaller the distance between graphs, i.e. the higher their similarity. Right: Silhouette plot for the two-group clustering dictated by the heatmap. The vertical red line denotes the average silhouette value (0.53)