CO2 slab model spectrum calculated with RADEX (van der Tak et al. 2007), each line in the spectrum is plotted separately. Slab model parameters are: density, 1016 cm-3; column density of CO2, 1016 cm-2; kinetic temperature, 750 K and linewidth, 1 km s-1. For these densities, the level populations are close to local thermal equilibrium (LTE). Spectrum and label colour correspond to the colours in Fig. 1
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