Slab model spectrum comparing CO2 emission (black) and 13CO2 emission (cyan) with the H2O emission (blue) at a resolving power of 28 000. The left panel shows a zoom of the 15 μm region, the right panel shows a zoom in of the region where the 13CO2v2Q-branch resides. Slab models uses the parameters fitted by Salyk et al. (2011b) for AS 205 (N) (see Table F.1). Due to the high resolving power individual Q-branch lines can be observed and blends are less likely to happen. A Keplerian linewidth of 20 km s-1 has been assumed. The 13CO2 fluxes have been multiplied by a factor of 10 for clarity.
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