Thousand guesses test, using Vesta observations with the Keck HIRES spectrometer. The axes are effective temperature, surface gravity and metallicity. On the left panel crosses show the initial guesses covering 1200 K in T_eff, 0.5 in log g and 1 dex in metallicity. A tight clump of circles slightly above the panel center shows the results illustrating robustness of SME optimization. The right panel shows a close up of the results. The spread is very small but has a structure reflecting cross-dependence of parameters and deficiency of numerical derivatives.