Fig. 2.
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Quiescent level QPO. Upper panel: 0.2–1 keV pn light curve with time bins of 1000 s, together with its baseline best-fitting model. Middle panel: Resulting residuals and, as a solid line, a sine function that is plotted to guide the eye. Lower panel: Residuals once the original light curve is fitted by adding a sine function to the baseline model.
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