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. 2015 Aug 28;10(8):e0136834. doi: 10.1371/journal.pone.0136834

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© 2015 Fertner 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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Fig 5 — Each ellipse illustrates a significant cluster (p<0.05) in one of the four time periods. The persistent clusters include a total of 551 farms situated in three distinct geographical areas. N indicates the number of farms inside each of the persistent cluster areas.