Wavelet power spectrum of a flare of source COUP 332 in the bottom panel. Contours are for confidence levels 67% (dotted line), 95% (dashed line), and 99% (continuous line). The hatched area is the cone of influence (COI), the region of the wavelet power spectrum in which edge effects become important (Torrence & Compo 1998). Top panel shows the observed light curve. Overplotted as a continuous line is the flare’s global shape. Time binning is 300 s.