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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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(a) Number of new sources () versus the total flow . (b) Fraction of existing sources whose type is changing () when the total flow varies from to . Here .

Inline graphic — (a) Number of new sources () versus the total flow . (b) Fraction of existing sources whose type is changing () when the total flow varies from to . Here .