Chemical evolution of H2, H+, and H as a function of the total number density for Model III, which employs the equilibrium metal cooling at all temperatures (red curves), and Model IV, which employs the non-equlibrium metal cooling for temperature T< 104 K (black curves and crosses). The effect of non-equilibrium cooling on the H2 evolution is negligible and produces the same results as the equilibrium cooling model (crosses). A horizontal line at ni/nHtot = 0.5 is sketched to represent the fully molecular stage.
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