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Fig. 3


Low-resolution spectrum of HD 179218 (open circles with error bars) scaled to the measured photometry at 11.3 μm (green filledcircles). The red dashed line is the corresponding Spitzer/IRS spectrum. The vertical dotted lines denote the bandwidth of the PAH-1, PAH-2, and Si-6 filters. The vertical dashed line indicates the region of the atmospheric ozone feature where proper spectroscopic calibration is cumbersome.

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