Fig. 8

Integrated spectra (black) and its best-fit stellar spectra (red) obtained with the pPXF approach (Sect. 4.2) are shown. The gas emission wavelength bands masked in the fitting are marked in dark blue. The insert highlights the NaD region with a zoomed view. The lack of good agreement in the doublet feature indicates that the NaD extra-absorption is interstellar in origin.
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