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. 2020 May 18;6:50. doi: 10.1038/s41378-020-0161-3

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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 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. 2 — a Gas-concentration profile in test setup A. b–d Transient conductivity profiles versus the gate voltage with respect to time for water (H₂O), methanol (MeOH), and ethanol (EtOH). e–g Relative magnitude of the converted 4D vectors versus time; h–j and relative magnitude of the 3D vectors by removing the carrier concentration vector from the 4D vectors