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. 2017 Apr 17;79(5):36. doi: 10.1007/s00445-017-1114-z

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© The Author(s) 2017

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. 7 — Direct comparison of SO₂ co-measured by SO2-AE and SO2-A4 in Multi-Gas^Direct, and SO2-3ST/F in Multi-Gas^Pump. Linear regression yields 1 ± 0.05 with correlation coefficients >0.9 for the full-time series. The two Multi-Gas sensors were deployed within centimetre distance (exception: metres distance during descent from BN)