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. 2021 Jan 24;3(2):192. doi: 10.1007/s42452-021-04172-9

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© The Author(s) 2021

Open AccessThis 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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Fig. 4 — Density profiles of one of our foam-formed fibrous materials. Plotted is the fibre area fraction as a function of distance through the sample in mm. The x and y-directions display an approximately uniform density profile throughout the sample. The variations in the z-direction indicates layering of the fibres (see Sect. 4). The majority of the fibres is in the xy-plane (horizontal) with the remainder of the fibres supporting these layers. The inset shows a binarized image of a vertical sample slice