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. 2020 Jan 6;378(2165):20180429. doi: 10.1098/rsta.2018.0429

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 4. — Lost City H₂ and CH₄ concentrations normalized to the concentration of ³He. Data from [9,11].