[Zn/Fe] vs. [Fe/H] for the present sample (333 stars), compared with literature. Symbols: red filled circles: present work; black squares: results for stars in common based on UVES data (Barbuy et al. 2015); blue filled pentagons: Bensby et al. (2017); magenta open heptagons: Howes et al. (2015, 2016); blue open heptagons: Casey & Schlaufman (2015). Chemodynamical evolution models by FB17 with formation timescale of 2 (black lines) and 3 Gyr (blue lines), or specific star formation rate of 0.5, 0.3 Gyr⁻¹ are overplotted. The model lines correspond to different radii from the Galactic centre: solid lines: r < 0.5 kpc; dotted lines: 0.5 < r < 1 kpc; dashed lines: 1 < r < 2 kpc; long-dashed lines: 2 < r < 3 kpc. A typical error bar is indicated in the right upper corner, corresponding to a mean between the two reference stars (Table 4).