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. 2020 Jun 16;11:3039. doi: 10.1038/s41467-020-16862-w

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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. 4 — Molar gas composition data for an UAS overflight on 07/06/18 during passive degassing from the central vent area (C), showing gas concentration timeseries for a SO₂ and CO₂, b SO₂ and H₂O and c, d the corresponding scatterplots, showing the least squares regression and 95% confidence intervals. Excess refers to the concentration of the gas species of interest above background, which was determined from clean air measurements made outside of the plume where SO₂ = 0. Gas molar ratios correspond to the gradient of the regression line shown. The flight path comprised horizontal transects through the plume around 20 m downwind of the vent. Each peak indicates passage through the plume, with troughs indicating positions outside of the plume (e.g. where SO₂ values = 0).