Thermal evolution versus the total number density for the three models described in Sect. 3.1. The red curve refers to Model I, which employs a simple prescription for the H2 formation rate on dust. The black curve employs the more accurate Cazaux & Spaans (2009) rate for H2 formation on dust, and the blue curve is the same Model II, but including the dust cooling as reported in Eq. (10). The magenta line represents the CMB floor at z = 3.
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