Fig. 9
VISIR N band spectra. Left panel: HD 155448 C, showing a silicate feature. Right panel: the arc, with strong PAH bands at 8.6, 11.3, and 12.7 μm. The y-axis scale is not identical in both figures, but was adjusted to optimally show the features. The gap between approximately 9.5 μm and 10.3 μm is due to incomplete instrument coverage (see Appendix A.5.2).
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