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. 2020 Sep 24;10:15694. doi: 10.1038/s41598-020-72653-9

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Diagram of the set-up used to monitor oxygen profiles at different positions along the root surface. Micromanipulator was moved in the xy axis to locate the oxygen sensor at the desired position over the root surface. Once positioned, it was moved on the z axis at 50 µm steps. Inset: example data of a recorded oxygen profile and estimation of the oxygen diffusivity. Line drawing was made from scratch using Adobe Illustrator v17.0.