Example of fitting profiles around 6743 Å (left) and 6757 Å (right). Top panels: solar reflected spectrum from Vesta. Bottom panels: spectrum of the metal-poor star HD 22879 (T_eff = 5884 K, log g = 4.45 dex, [Fe/H] = − 0.82 dex, v_mac = 3.46 km s⁻¹, v sin i,= 1.37 km s⁻¹). The synthetic profiles are for the best [S/Fe] value determined (before correction with respect to solar value) and for ± 0.1 dex deviation from it.