The curves for the estimation of the probability of SEP occurrence when both the speed (V _CME, X-axis) and the width (Halo, Partial Halo, and Non-Halo) of a CME are known. Each panel corresponds to an integral energy (i.e., E > 10−; >30−; >60− and >100 MeV). Within each panel, three fits are presented, one per CME width – color-coded as: Halo (blue), Partial Halo (red), and Non-Halo (green) CMEs. The gray border hatched rectangle area provides the limit for the V _CME. See text for details.