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. 2017 Jun 5;8:15766. doi: 10.1038/ncomms15766

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Copyright © 2017, The Author(s)

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) VN and shaded MOLA DEM (for location, see Fig. 3b). (b) VN, thresholded PBTH depth and local maxima ‘seeds' for generating VN area following multi-flow direction on depth grid. (c) VN, VN area polygon and shaded MOLA DEM. (d) Depth profile along XY in b. Dashed vertical line indicates where the flow would stop, which defines the boundary of VN area polygon as shown in c.