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. 2019 Apr 23;411(24):6309–6317. doi: 10.1007/s00216-019-01790-6

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — (a) LC-MS extracted ion chromatogram (m/z 137.071) for urine, (b) LC-FAIMS-MS extracted ion chromatogram (m/z 137.071) for the same urine sample over the full CF range, (c) CF spectrum (CF − 0.5 to 3.5 Td) and (d) extracted ion chromatograms (m/z 137.071) at CF 0.17 Td (lower left) and at (e) CF 1.5 Td (lower right)