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. 2024 Oct 3;15:8562. doi: 10.1038/s41467-024-52087-x

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 6 — Concentration of the 4 reported ceramides in NIST RM 8231-1 (DB) plasma before and after re-calibration using the NIST SRM 1950 concentration. Each circle corresponds to one measurement from one NIST DB sample shipped to each of the participating laboratories before (None) and after (SRM 1950) re-calibration with the SRM1950 concentration of the corresponding laboratory (see text). The horizontal bars correspond to the mean ±1 × SD of all shown data per group (number of data points indicated for each group). This plot contains all datasets before and after re-calibration, no outlier removal has been performed.