The CDFs constructed by the database for each integral energy of choice for the estimation of the peak flux (Peak flux [pfu], X-axis), when the SXR solar flare magnitude is known. Lines depict the exponential cut-off fits to the data points per case. Panel (a) corresponds to a filtering of the integral energy at E > 10 MeV. The left-hand column (panels (b), (d), (f)) corresponds to a filtering integral energy at E > 30 MeV, and the right-hand column (panels (c), (d), (g)) to a filtering integral energy at E > 100 MeV. Black color denotes the SXR flare flux bin in each panel. See text and Table 3 for details on the bins and the obtained parameters of the fit per case.