Zr II lines in the UVES spectrum of the target star 20885 (dots) overlaid with the synthetic spectrum (grey solid line) computed using the ATLAS9 model with T_eff = 4359 K, log g = 1.41, [Fe/H] = -0.74, [Zr/Fe] = 0.30 dex, ?_micro = 1.82 km s^-1, ?_macro = 3.00 km s^-1 and solar-scaled elemental abundances (Grevesse & Sauval 1998). The left panel shows the vicinity of Zr II 511.2270nm line, the right panel that of 535.0089 nm and of 535.0350 nm Zr II lines. Other solid lines are synthetic profiles of individual lines, left panel: Zr II 511.2270nm (red line), MgH 511.2080 nm (green line), CN 511.2360 nm (blue line); right panel: Zr II 535.0089 nm and 535.0350 nm (red line), V II 535.0358 nm (orange line), Tl I 535.0456 nm (cyan line), CN 535.0215 nm (blue line).