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Fig. 4

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Class-0 ETGs i.e. showing neither PAH nor ionic or molecular emission lines in their MIR spectrum. The broad silicon features at  ≈ 10 μm is clearly visible in all spectra. According to Bressan et al. (2006), these spectra may represent passively evolving ETGs. The thick black line represents the average passive ETG spectrum shown in Fig. 2. The fluxes have been arbitrary scaled in order to separate the spectra.

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