Lower panel: the differences in abundances derived assuming a pure absorption source function and when a scattering term is introduced. All calculations are done with turbospectrum. All lines are considered and are shown at their wavelengths. Black points trace Fnx05-42, blue stands for the 2 Sextans stars, red for Scl07-49 and green for Scl07-50. Upper panel: [FeI/H] when scattering is properly taken into account. There is no trend of abundance with wavelength, while there was a clear increase at bluer wavelengths before correction.