Mass fraction produced by the s-process channel of production (top panels) and [X/Eu] vs [Fe/H] (bottom panels) for Zr (left panels), Ba (central panels) and La (right panels) for models with different IRV distributions. In the top panels, we show the results for models adopting the reference IRV distribution (R150, thick solid lines), R300 distribution (thin dashed), DIS2 distribution (thin dash-dotted), and DIS3 distribution (thin dotted). In the bottom panels, blue dash-dotted lines and cyan shaded regions are genuine chemical tracks and predictions accounting for observational uncertainties (i.e. synthetic model) for the model with the DIS2 distribution. Data are as in Fig. 8.