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. 2020 Apr 24;412(17):4089–4099. doi: 10.1007/s00216-020-02640-6

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© The Author(s) 2020

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 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/.

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Fig. 1 — Optimization of the MS parameters: MS parameters that were tested in this study. a Peak intensities of all tested compounds with different spray voltages. b Peak intensities of all tested compounds with all available resolutions. c Peak intensities of all tested compounds with several AGC. d Injection times. Each data point is the mean value of an experimental triplicate. Relative standard deviations for all measurements are reported in ESM Tables S1-S4. Optimal conditions are indicated using a dotted box