Fig. 2.

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2D plot on the left: Dynamic WWZ power in time-frequency space during ObsID P011466101502. The red contours represent regions (in time-frequency space) of QPO activity with a significance > 3σ. the units of WWZ power are (root-mean-square/mean)2 Hz−1. The line plot on the right side of all panels shows the corresponding time-averaged WWZ power spectrum over the whole observation in each band. The dashed red line indicates the peak power at a QPO frequency of 0.082 Hz, and the dashed blue lines correspond to ±20% around peak frequency. Top panel: For the HE data in the 30–250 keV band. Middle panel: For the ME data in the 5–30 keV band. Bottom panel: For the LE data in the 1.3–15.0 keV band.
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