Left panels: O vi 1032 Å relative intensity and Doppler shift variations over region A (top) and B (bottom). The time series have been denoised, respectively, with a 5-point and 3-point moving average. Vertical lines delineate the time interval over which the CCF (right panels) was calculated, roughly corresponding to the maximum power in the respective wavelet spectra. The red dotted lines are the c.l.