Illustration of the NSS scheme used for cross-section nuisance parameters (inelastic on the left and production on the right; see Eqs. A.7-A.9). Colour-coded solid lines correspond to existing cross-section parametrisations: inelastic on the left, B94 (Barashenkov & Polanski 1994), W97 (Wellisch & Axen 1996), T99 (Tripathi et al. 1997, 1999), and W03 (Webber et al. 2003); production on the right, W98 (Webber et al. 1998a,b,c), S01 (A. Soutoul, private communication), W03 (Webber et al. 2003), and G17 (Moskalenko et al. 2001; Moskalenko & Mashnik 2003). The grey lines correspond to the median, 68%, and 95% CLs resulting from varying the NSS parameters. For σ_NSS of the cross-section nuisance parameters (reported in Table A.1), we chose the NSS values leading to the 68% CLs (dotted grey lines).