Evolution of the best-fit parameters and asymmetric 1σ errors (extracted from MINOS), increasing the number of nuclear cross-section reactions used as nuisance parameters (from left to right on the x-axis); Model A (top) and B (bottom) are shown. For every additional reaction as nuisance, four different fits are performed: starting either with G17) or W03 parametrisations for the production cross sections; using either CL or NSS for the implementation of nuisance parameters. The black dashed line in the xs panel corresponds to the threshold . See text for discussion.