The large dots, colour-coded by R_Edd, represent the power spectra of the data (plotted as power × frequency), after the frequencies and amplitudes have been re-scaled according to the mass and R_Edd of each bin and the best-fitting scaling parameters, C = −0.55, D = −0.35, and F = −0.4. The black dots represent a “folded” model constructed from a bending power law model with α_L = −1 and α_H = −3. Frequencies are in units of day⁻¹.