Fig. 4.

Panel a: temporal evolution of the total flux of SXR emission (solid line) and the smooth estimate of the SXR emission (dashed line). Panel b: wavelet analyses of the SXR emission. The black contour in panel b shows 95% confidence level. The cross-hatched regions represent cone of influence regions, where the edge effect is important. Three dotted lines indicate the times t = 288.1, 292.4 and 301.0 s, respectively.
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