Volume cooling rate defined in Eq. (1) for a hydrogen-nuclei number density of 1 cm-3 as a function of temperature for different H2 to total hydrogen mass ratios fH2. For high fractions of H2 and at such densities, the cooling can become slightly more important just below 104 K when the H2 mass fraction is reduced, because the contribution of collisions with atomic hydrogen dominates in this range of temperature.
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