Velocity dispersion σ, age, metallicity and [α/Fe] ratio as a function of the Sersic index n. Full dots are the early-type dwarfs of this paper, while open triangles are the bright ETGs selected from A07 (see text for details). We excluded RR143_09192 and RR242_36267, for which we obtain a low-quality fit (see Sect. 3.2), and RR216_12209, which is classified as an Sc.
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