. 2014 Apr 10;9(4):e92382. doi: 10.1371/journal.pone.0092382
© 2014 Zhong 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.
Figure 12. Edge maps 
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.
