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. 2014 Jul 16;9(7):e102007. doi: 10.1371/journal.pone.0102007

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© 2014 Louf 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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(Left) Length of subway networks in the world as a function of the number of stations. A linear fit gives (Right) Empirical distribution of the inter-station length. The average interstation distance is found to be and the relative standard deviation is approximately .

Inline graphic — (Left) Length of subway networks in the world as a function of the number of stations. A linear fit gives (Right) Empirical distribution of the inter-station length. The average interstation distance is found to be and the relative standard deviation is approximately .