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Fig. 1


Main window: ISO-SWS spectrum of IRAS 171503224 in grey (Sloan et al. 2003). The continuum constructed over the 9.7 μm band of amorphous olivine (as explained in Sect. 4.3) is shown as a dashed black line. Top-left inset: optical depth of the 9.7 μm absorption feature (see Sect. 4.3) in grey and in dashed black the continuum under the 11.3 μm band of forsterite. Bottom right inset: 69 μm band as observed with Herschel/PACS in grey (Blommaert et al. 2014) and the constructed continuum under the 69 μm band in dashed black.

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