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. 2019 Oct 22;9:15153. doi: 10.1038/s41598-019-51574-2

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© The Author(s) 2019

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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Topography, distribution of base-level change knickpoints and elevation of knickpoint zones on Mars. The lower map shows the topography of Mars with superimposed possible base-level change knickpoints categorized by the knickpoint zone in which are included. The upper part of the figure comprises, on the right, the Kernel Density Estimate of base-level change knickpoints by elevation and, on the left, a graph displaying the distribution by elevation of the possible base-level change knickpoints against their longitude. Both graphs share the same elevation axis (Y-axis). In the upper-left graph each knickpoint is associated with a number indicating the channel system within is located. The upper-left graph and lower map share the same longitude axis (X-axis). The knickpoints contained within each knickpoint zones have been represented by a point with the same colour than the knickpoint zone. Knickpoints represented by the black colour are not contained within any knickpoint zone. Some of the 34 potential base-level change knickpoints are located too close to each other and thus overlap at this map scale (see Supplementary Table 1 for the complete list of knickpoints).