Observed spectrum (black) of the bulge star B6-F1 (S/N = 54). The lines for abundance determination of Zr (three lines), La, Ce, and Eu (one line each) are marked out as the orange regions. The yellow regions are the manually placed continuum and the red spectrum is the synthetic one. The segments within which the synthetic spectrum is modelled are marked as the white wavelength regions between the blue vertical lines in each panel. The four horizontal lines above each spectrum indicate the lines’ sensitivity in the stellar parameters T_eff, log g, [Fe/H] and ξ_micro, respectively, where green is more sensitive than blue.