Distribution of the SEP events with respect to , for the five groups, i.e. G1–G5, as defined by Cane et al. (2010). Events with a positive Δt ₂ had associated time of maximum of the derivative of the SXRs that started prior to the onset time of the type III bursts, while events with a negative Δt ₂ had associated time of maximum of the derivative of the SXRs that occurred after the onset time of the type III bursts.