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Fig. 9

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Sketch of a Herbig group Ib star. In the VISIR data, we find that PAH emission in the spectra of HD 169142, HD 135344 B, and Oph IRS 48 is dominated by PAHs located in the inner region (i.e. ≲50 AU). While in HD 97048, the PAH emission is dominated by PAHs in the outer disk surface (as shown by Lagage et al. 2006; Doucet et al. 2007).

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