Top panel: range of variations in the kernel spectra as a function of the number of PAH species considered in the mixture: 10 species (light grey) through 90 species (dark grey). In red is the range for 100 species and in black the range for 548 species. Bottom panel: evolution of the norm Nr which captures the variations in the kernel spectra (blue line) and the norm Nobs which captures the variations in the observations (see text for details).
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