Reconstructed simulated data from superposed damped sinusoids. Top: individual sinusoids with random start, amplitude, frequency, and damping time. Middle: simulated data as the sum of damped sinusoids. Bottom: observed data, normalised by dividing by a 5 s moving average, at orbital phase (φ = 1.08 − 1.11) where a significant large QPO amplitude is observed. Similar features can be recognised in the data and in simulated light curves.