Fig. 5
The CO2 emission region of IRAS 06338, compared to other post-AGB sources showing CO2 gas emission (Cami & Yamamura 2001; Gielen et al. 2009). Dotted lines show the location of 12C16O2 features, dashed lines give 13C16O2 and dot-dashed lines show 16O12C18O. Dot-dot-dashed lines mark unidentified features. The spectra are scaled and offset for comparison. For HD 52961, the underlying feature at 16 μm was removed.
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