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. 2022 Dec 13;13:7706. doi: 10.1038/s41467-022-35419-7

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Fig. 4 — Critical HEI as a function of OH excess (E_OH) and hydrogen production method (green and blue H₂ with 0.2, 0.5, 1% CH₄ leak rates, respectively). Dashed (dotted) lines are obtained for a 20% increase (decrease) in the H₂ uptake rate by soil bacteria (k_d). Triangles mark the critical HEI for the best estimate of E_OH.