Ages, metallicities, and [α/Fe] ratios at r < re/2 versus velocity dispersion. Different symbols indicate the group membership. For comparison, we also plot the stellar population parameters for a selection of galaxies from the bright ETGs of A07 (open triangles, see text for details). The solid line indicates the least-square linear fit to the (dwarf + giant) ETG sample, where we have excluded the Sc galaxy RR216_12209 (big open circle), and the two low quality-fit galaxies (see Sect. 3.2 for details): RR143_09192 (big open square) and RR242_36267 (big filled circle). The dashed and dotted lines are the separate fits to the dwarf (σre/2 < 100 km s-1) and giant (σre/2 ≥ 100 km s-1) samples, respectively. The slope (α), zero-point (β), and scatter of the fits are indicated in the panels.
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