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Fig. 3.
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Average spectra (normalized at 20 μm) for the three ULIRG groups defined in Sect. 4.1. The grey vertical dashed lines denote the location of the strongest PAH bands (6.2, 7.7, 8.6, 11.3, 12.7 and 17 μm). The yellow shaded region highlights the different degrees of silicate absorptions for the various ULIRG groups.
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