Top panel: variation of the abundances of neutral atomic hydrogen (blue dotted), molecular hydrogen (green dashed-dotted), neutral chlorine (orange dashed) neutral carbon (brown, dashed-triple dotted) and carbon monoxide (red) as a function of depth into the cloud. We note that for H2, the curve corresponds to half the molecular fraction (since f = 2nH2/nH). Middle panel: variation of the temperature across the cloud. Bottom panel: heating rates for the main sources. The cooling rate, which is largely dominated by [C ii]157 μm emission, equals the total heating rate since the cloud is assumed in thermal equilibrium.
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