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Fig. 6

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The spectra of all stars in our sample with an infrared spectrum dominated by the 10 and 18 μm features of silicates and gehlenite (Group I). The top left panel shows the smoothest features at 10 μm, while the features in the top right panel show substructure at 9.8, 11.2 and/or 13 μm. The bottom panel shows CD-39 2449, with the relative flux contribution of silicates and gehlenite.

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