Impact of inelastic (left) and production (right) cross-section uncertainties on Li/C (first and third column) and Be/C (second and fourth column) ratio for specific reactions as a function of rigidity. In each panel the relative difference between (inelastic or production) cross-section parametrisations with respect to a reference one is shown in blue (associated with the right y-axis), whereas the impact on the calculated ratio (in model SLIM) of varying the cross-section is shown in black (associated with the left y-axis). To guide the eye, the vertical red line indicates the rigidity of the first AMS-02 data point. The bottom panels show the overall impact when all reactions (i.e. all nuclei in the network) are replaced. Inelastic cross-sections are B94 (Barashenkov & Polanski 1994), W96 (Wellisch & Axen 1996), T99 (Tripathi et al. 1996, 1999), and W03 (Webber et al. 2003). Production cross-sections are W98 (Webber et al. 1998a,b,c), S01 (Soutoul, priv. comm.), W03 (Webber et al. 2003), and G17 (Moskalenko et al. 2001; Moskalenko & Mashnik 2003).