Fig. 2.
D4000 spectral index measured from SDSS fiber spectroscopy. (Top left), optical depth in the diffuse ISM (top right) in the MAGPHYS model derived by Rowlands et al. (2012), isophotal r-band major axis (bottom left), and r-band Sersic index (bottom right; Kelvin et al. 2012) as a function of luminosity-weighted stellar age. The typical errors are shown as large crosses.
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