Hβ and [MgFe]′ indices (left panel) and ⟨ Fe ⟩ and Mgb indices (right panel) measured along the major (triangles) and minor axis (circles). The open symbols correspond to the values measured in the center of the galaxy and the black lines connect values measured in adjacent radial bins. The radial bins are centered at , and along the major axis and at and along the minor axis. The grids indicate the models by Thomas et al. (2003). In the left panel the age-metallicity grids are plotted with two different [α/Fe] enhancements: [α/Fe] = 0.0 dex (solid lines) and [α/Fe] = 0.5 dex (dashed lines). In the right panel the [α/Fe] ratio-metallicity grids are plotted with two different ages: 8 Gyr (solid lines) and 12 Gyr (dashed lines).