Scatter plots of the well-connected events in the recent data set used for this study, as a function of flare intensity for 100 keV electron intensity (top, left), 25 MeV proton intensity (top, right), and 100 keV electron to 25 MeV proton ratio (bottom right), and scatter plot of 100 keV electron to 25 MeV proton ratio versus 25 MeV proton intensity (bottom left). The observations are colour-coded according to the results of the HDBSCAN clustering analysis. The grey points denote points that the algorithm deemed as outlier points. The lines connect observations associated with the same flare.