Fig. 2
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Chemical evolution for two models with [Fe/H] = −3.0, but differing C/O ratios at T = 3500 K, ρ = 10−9 g cm−3 (corresponding to chromospheric background layers). The vertical dash-dotted lines show the time a species has to set into equilibrium. In the oxygen-dominated atmosphere, CH is depleted compared to OH, while the opposite is true in the carbon-dominated atmosphere.
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