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. 2022 Apr 28;8:32. doi: 10.1038/s41522-022-00299-8

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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. 1 — a Sampling was carried out by scrapping the dust accumulating below the tank lid and around the filling point. b Alpha diversity metrics at the ASV level: observed ASVs -or richness- (left panel) and Simpson index (right panel) for all the samples grouped by type of fuel. ASV amplicon sequence variant. Centerline = median; bounds of box = Q1 and Q3; lower whisker = smallest observation greater than or equal to lower hinge—1.5 * IQR; higher whisker = largest observation less than or equal to upper hinge + 1.5 * IQR; Q quartile, IQR interquartile range.