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. 2022 Sep 8;9:551. doi: 10.1038/s41597-022-01656-0

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© The Author(s) 2022

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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Fig. 4 — GR - SR difference as a function of GR reflectivity (left) and SR reflectivity (right) displayed in a two-dimensional histogram for all matched volumes between 2014 and 2019. White dots indicate the median GR - SR differences per 1 dBZ bin. Colors indicate the number of samples and the vertical dashed lines the selected reflectivity thresholds for the calibration offset calculation.