Graphical representation of the power-law energy distribution model for both the entire sample of targets (left) and excluding the magnetar candidate SGR 2013+34 (right). The x-axis represents the slope of the power-law energy distribution γ, while on the y-axis are the number of events with an energy greater than the energy emitted by the FRB-like event of SGR J1935+2154 λ_mag. The two free parameters of the model are γ and λ_mag, and their combinations produce ℛ_tot (Eq. 8) for the entire magnetar sample, respectively. The rate of events obtained in every case are shown using a fixed logarithmic color code presented in the color bars. The solid black lines represent the upper limits obtained with our observing campaign on the possible combinations of γ and λ_mag, while the black dashed lines show reference values for graphical purposes. The difference between the upper and lower panels is the scale of the y-axis: The upper panels are in linear scale, and the lower panels are in logarithmic scale.