Observed distribution of Ba in log(ϵ) abundances (left panels) and in abundance ratios relative to iron (right panels). The histogram distributions of [Ba/Fe] for s-rich and s-poor stars selected as in Fig. 4, have been represented in red and blue, respectively. The upper panels represent Ba abundances with Solar System (S.S.) isotopic ratios adopted for both s-rich and s-poor stars. In the middle panels, an r-only isotopic ratio has been applied for the s-poor stars. The lower panels represent the same abundances represented in the middle panels corrected for NLTE effects.