Abundance ratios in field and open cluster stars: abundance ratios [El/Fe] versus [Fe/H] of solar neighbourhood dwarf stars (cyan empty triangles), of inner disk/bulge giant stars (red empty squares), of stars in Trumpler 20 (magenta filled circle), in NGC 4815 (green filled triangle), and NGC 6705 (blue filled square). In panel a) the curves are the model of R10 at three R_GC: 4 kpc (dotted line), 6 kpc (continuous line), and 8 kpc (dashed line). The curves shown in panel b) are obtained with the model of M09. The theoretical ratios are normalised to the solar abundances predicted by each model, with the exception of [Mg/Fe] in M09 model, which is displaced by other +0.15 dex to match the data.