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. 2015 May 20;10(5):e0126713. doi: 10.1371/journal.pone.0126713

Fig 2. Clustering of the United Kingdom.

Fig 2

The first panel shows the 2,404 pixels forming 14 well defined clusters with modularity value of 0.37. The second panel shows the clusters of the randomly rewired graph with 6 clusters. The third panel shows the result of the graph with finer HEALPix grid with 13 clusters. On each map, each cluster of geo-pixels has a different unique color. The boundaries between the four countries are shown in thicker lines, while the second-level subnational division is indicated with finer lines, depicting the second type of administrative units analyzed.