Fig. D.1.
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Modeling results of NHI, NOH, and NCO under different physical parameters (from left to right, respectively). The orange, green, and blue curves represent the evolution timescale t = 105, 105.5, and 106 yr. The solid, dashed, and dotted curves represent the gas densities nH = 102, 102.5, and 103 cm−3. The black points denote data from observations.
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