[Zn/Fe] vs. [Fe/H] for present results compared with literature abundances for halo and bulge stars. Panel a): plotted in the metallicity range −1.5 < [Fe/H] < +0.7, corresponding to that of sample bulge giant stars, compared with the bulge dwarfs by Bensby et al. (2013). The subsamples are indicated by different symbols and identified by the central field (l, b) values; Panel b): plotted for −4.4 < [Fe/H] < + 0.7, encompassing halo stars from Cayrel et al. (2004), halo and thick disk stars from Ishigaki et al. (2013) and Nissen & Schuster (2011), and again the bulge dwarfs by Bensby et al. (2013). The symbols indicate: present data in black: open triangles: NGC 6553 field (designated B3), filled circles: Baade’s Window field (BW); open squares: field at −6° (designated B6); filled triangles: Blanco field (designated BL); open stars: Red clump stars in Baade’s Window (designated RC). Literature data: red three-pointed stars: Cayrel et al. (2004); green crosses: Ishigaki et al. (2013); red open circles: Nissen & Schuster (2011); green 3-pointed stars: Bensby et al. (2013). A representative error bar is given in the lower right corner of the upper panel.