Abundances of sample stars relative to iron as a function of their mean ⟨$R_{\mathrm{H}\mathrm{K}}^{\mathrm{\prime }}$⟩ indices. The upper row provides the abundances of the Mg, Al, and Si α elements. The upper middle row provides the abundances of the Ti, Cu, and Zn iron-peak elements. The lower middle row and the lower row show the abundances of the Sr, Y, and Zr light; and the Ba, Ce, and Nd heavy s-process elements, respectively.