Impact of inelastic cross-section uncertainties on B/C ratio for specific reactions as a function of rigidity, shown for Model A and Model B discussed in Sect. 2.1. In each panel, two quantities are shown: the relative difference between a cross section (of a given reaction) and a reference parametrisation T99 in blue (the associated y-axis is on the right-hand side of the plot, also in blue), and the associated impact on the B/C ratio for this cross-section parametrisation w.r.t. to the reference B/C (the associated y-axis is on the left-hand side in black). 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. For the latter panel, dark and grey curves correspond to IS and modulated (ϕ_FF = 0.8 GV) B/C ratio to emphasise that results are independent of the modulation level.