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. 2019 Dec 5;9:18379. doi: 10.1038/s41598-019-54647-4

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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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Quantification of the water uptake in the bottom and top slice as a function of time. The reconstructed slices are segmented using a constant threshold and the total number of pixels classified as material is plotted. The insets show the segmented bottom slices at different time points (along with the reconstructed grey-level image for the first time point which was used to automatically determine the threshold for the segmentation).