Barium abundance, [Ba/Fe], versus metallicity, [Fe/H]. Blue dots represent the 1D LTE barium abundances derived from the barium line at 5853 Å. Green dots represent the corrected [Ba/Fe] values obtained for a subset of five stars by adding the 3D NLTE corrections (Ba corr^(*) − Ba corr^(⊙)) given in Table 3 to the 1D LTE [Ba/Fe] abundance. The blue line (resp. green line) is the linear fit to the 1D LTE (3D NLTE) abundances.