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. 2016 Dec 15;11(12):e0168604. doi: 10.1371/journal.pone.0168604

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© 2016 Zhang 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 credited.

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Fig 10 — The “NDemand” represents the difference in normalized demand between user groups. The left panel represents the comparison between March 2012 and March 2013, and right panel represents the comparison between March 2013 and March 2014.