Fig. 3
Bottom panels: extracted spectra using NMF, normalized at 11.2 μm. The vertical line represents the peak position of the estimated PAH0 spectra. The red line represents the average spectra out of 100 iterations. The grey envelope shows the minimum and maximum spectra and the black envelope shows the 1-σ error of the 100 iterations. Upper panels: spatial distributions of the weighting factors obtained by Least Squares Fitting of the observed spectra in the datacube using the BSS extracted spectra shown in red in the lower panel.
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