Time evolution of the chemistry for T = 12 K. The different colors stand for different densities: n = 104 (blue), 105 (green), 106 cm-3 (red). The thick lines represent the o/p H2 ratio. The thin lines represent the p-D2H+/o-H2D+ ratio. The different line styles stand for different CO abundances: complete depletion (full), xCO = 10-6 (dash), xCO = 10-5 (dash-dot).
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