Fig. 1.
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Power density spectrum and QPO analysis results. Panels a–c display the PDS in black and the HHT decomposed QPO in green from (a) a single NICER observation, (b) combined NICER observation data, and (c) a single NuSTAR observation. The prominent peak at 0.2 Hz in these panels confirms the stability of the QPO signal for different observations.
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