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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. 9 — Individual AE signals (red) and AE waveform parameters (black arrows) factor map of the principal component analysis (PCA) executed on the entire AE dataset registered by sensor AE₁ on Fraxinus excelsior L. during dehydration. Outliers separated from the major cluster correspond best with the number of embolism detected by µCT (457). AE waveform parameters ABSENERGY, DURATION, SIGSTRNGTH, COUN, and AMP (Table 4) are correlated with the first dimension explaining 22% of the data distribution, and AE parameter FREQPP2 (Table 4) negatively correlated with the second dimension explaining 22% of the data distribution