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. 2014 Dec 26;9(12):e112606. doi: 10.1371/journal.pone.0112606

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© 2014 Corominas-Murtra et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The composition of the -core in terms of nations reveals that the multiplex system is organised around the elites of the three existing nations, whose members are depicted with different colours (see text for the use of colours). We have a) the characteristic for , where we find that the -critical level is located at b) after the application of the -core (), three components appear isolated, to be identified as the three communities composing the -core. Such communities are almost uniformly populated by members of the same nation. In c) we have the deepest -core, which contains members of only one nation. Interestingly, the composition of the deepest -core of the , , d), is absolutely different from the composition of the deepest -core of the same net, located at , showing interesting qualitative differences between these two approaches of core extraction. All pictures belong to the period 1140–1200.

Inline graphic — The composition of the -core in terms of nations reveals that the multiplex system is organised around the elites of the three existing nations, whose members are depicted with different colours (see text for the use of colours). We have a) the characteristic for , where we find that the -critical level is located at b) after the application of the -core (), three components appear isolated, to be identified as the three communities composing the -core. Such communities are almost uniformly populated by members of the same nation. In c) we have the deepest -core, which contains members of only one nation. Interestingly, the composition of the deepest -core of the , , d), is absolutely different from the composition of the deepest -core of the same net, located at , showing interesting qualitative differences between these two approaches of core extraction. All pictures belong to the period 1140–1200.