Morlet wavelet power spectrum as a function of time for HAT-P-7, where the time series was binned by 31 points. The colour changes from red at low power to blue at high power – the colours are on a logarithmic scale. The cross-hatched regions at high and low times indicate the cone of influence where edge effects become important (see Torrence & Compo 1998). No clear signatures from rotation are apparent.