Chemical evolution for H2 as a function of the total number density for different physical conditions, Cρ = 10, Z = Z⊙, and z = 0 without shielding (red curve), and with shielding (blue curve), and our reference model with Cρ = 1, Z = 0.5 Z⊙, z = 3, labelled as Model Ia (green curve).
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