Effect of the reverberation process on the power spectrum. The data are shown as a solid red line. The coloured envelopes display the power spectra from 100 000 simulated curves for different values of R_BLR. Each panel considers different values for σ_DRW. In this plot we use R₀ = R_MK11, ⟨M⟩ = 0.3 M_⊙, v_e = 700 km s⁻¹, and f_BLR = 0.432 ± 0.036. The black dashed line marks the boundary between low and high frequency. While the high-frequency range is never well represented with pure microlensing (blue), it is very sensitive to a change in the reverberation parameters.