Fig 7. Clustering of the 28 member countries of the European Union combined with second-level results.

The 22,888 pixels form 10 well defined clusters with modularity value of 0.67. Here the central cluster is replaced by the 10 sub-communities obtained by its second-level partitioning. Each cluster of geo-pixels has a different unique color. The sub-communities of the central cluster have different shades of green. The borders of countries are marked depicting the administrative units of this graph.