SPE f₈₀₀ fluence cumulative occurrence rate. Flares with the peak SXR flux exceeding the given GOES class are shown with different colours. Black and open blue dots represent statistics of the observed GLEs and ESPEs, respectively. Coloured dashed and dotted lines correspond to S23 power-law and Weibull approximations, respectively (see Figure A.1), and the CCP shown in Figure D.1. Shaded areas represent a 1σ uncertainty.