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. 2019 Dec 17;15:153. doi: 10.1186/s13007-019-0543-4

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© The Author(s) 2019

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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 7 — Experimental setup of the Fraxinus excelsior L. tree in the environmental µCT (EMCT) scanner. The EMCT continuously rotates around the stationary tree without the risk for twisting and winding of sensor cables. The carbon fiber tube was designed to ensure stable and centered positioning of the tree during µCT scanning. The tree is equipped with two broadband point-contact AE sensors in a pvc spring-containing holder to continuously register AEs from the progressively dehydrating xylem (AE₁, AE₂), and a point dendrometer to continuously register xylem shrinkage. The red circle indicates an aluminum enclosed leaf used for pressure chamber measurements to determine xylem water potential