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. 2018 Sep 4;9:3584. doi: 10.1038/s41467-018-05902-1

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© The Author(s) 2018

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. 2 — Graphical results of mechanical analysis by AFMech Suite for 0.15 μ-gel. a Morphology map at zero force, vertical color bar represents height in nm. b Young’s modulus map in logarithmic scale at medium indentation (0–20% of maximum value). c Qualitative Young’s modulus tomography on relative indentation from white line in (b). d Qualitative Young’s modulus tomography on absolute indentation from line in (b). Vertical color bar for (b–d) represents logarithm base 10 of Young’s modulus in Pa. e Apparent Young’s modulus vs. indentation (inset: force vs. indentation) for points 1 and 2 of (b) comparing AFM results and FEM simulations for boundary conditions: no slip (FE hard) and free to slip (FE free)