Upper panel: residual spectra averaged for all the spectra (black line), nuclei (grey line) and spectra belonging to zones that are between 0−1 HLR (pink line) and between 1−2 HLR (yellow line). Middle panel: residual spectra averaged for zones inner to 1 HLR and for Hubble type. Bottom panel: as in the middle panel except for spectra of zones located between 1 and 2 HLR.
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