Total integrated rms and QPO centroid frequency of each orbit from the two Astrosat observations. The inset shows the centroid frequency, and the corrected rms in the QPO, detected in individual orbits of NuSTAR, and in 2 ks regions of the XMM-Newton light curves. Total rms values are computed in the 0.5–50 Hz range. We use colours and shapes to distinguish the type of QPO, and whether the measurement was made during the flip-flop period, or not.