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. 2019 Jul 3;9:9602. doi: 10.1038/s41598-019-46092-0

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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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Diameter classes of the xylem vessels in the stems of the cvs. Leccino and Cellina di Nardò. (A) Transverse sections of olive stems stained with safranin solution to enhance void space of xylem vessels. (B) Distribution of xylem vessels diameter observed in the stem of Olea europaea cvs. Leccino and Cellina di Nardò. Please see Table 2 for further statistical analysis.