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Fig. 1


Comparison of the peak strength definition adopted in our work and that obtained by Olofsson et al. (2009). Blue stars are data extracted from c2d program Spitzer spectra (Evans et al. 2009), while yellow squares are data extracted from CASSIS (Lebouteiller et al. 2011) Spitzer spectra. The red solid line is the reference. Dot-dashed lines indicate a 50% deviation from the one-to-one relation. Olofsson et al. (2009) data are based on c2d spectra and do not contain errors.

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