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. 2011 Jan 7;6(1):e15923. doi: 10.1371/journal.pone.0015923

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Roth 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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Loglog plot of the histogram of the number of trips between two stations of the tube system. The line is a power law fit with exponent .

Inline graphic — Loglog plot of the histogram of the number of trips between two stations of the tube system. The line is a power law fit with exponent .