Comparison of the spectra of a high- and a low-α star with similar atmospheric parameters and [Fe/H]. The spectrum of G 159-50 (T_eff = 5624 K, log g = 4.37, [Fe/H] = −0.93, [α/Fe] = 0.31) is shown with a full drawn (blue) line, and that of CD −45   3283 (T_eff = 5597 K, log g = 4.55, [Fe/H] = − 0.91, [α/Fe] = 0.12) with open (red) circles. The strengths of the Mn and Fe lines are about the same in the two stars, whereas the Cu, Zn, Y, and Ba lines are weaker in the low-α star.