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. 2020 Feb 24;11:1014. doi: 10.1038/s41467-020-14679-1

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© The Author(s) 2020

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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Fig. 10 — a Cumulative fractional area and b cumulative number per m² versus diameter of rocks near the InSight lander as well as those measured at the Spirit (Spirit CMS for Columbia Memorial Station) and Phoenix (PHX) landing sites. Also shown are exponential model size-frequency distributions for rock abundances (k) of 1%, 2%, 3%, 5% and 10%³⁰. Note curves in b are not exponentials and approach a straight line at small diameter (note that fractional area is dependent on the diameter squared, whereas cumulative number is not), but are matches to the exponential models based on cumulative fractional area in (a). Surface rock counts are: near and far RAD spots (NSYT NFF RAD and NSYT FF RAD, respectively), the workspace (NSYT WS), the area to the northwest (NSYT NW), and the area to the south with the largest rocks (NSYT LRG). Spirit CMS from Golombek et al.³³, Phoenix intermediate area (PHX INT) from Heet et al.⁶⁸ and Phoenix largest rocks (PHX LRG) from Golombek et al.³². Measurement uncertainty as stated earlier is between 1–4 mm, which would have no appreciable effect on the plots.