Fig. 2
Top: PCA 16 s bin light curve in the 2–20 keV band. The boxes show the sections of non-dip and dip used for PDS and spectral analysis. Middle: the PDS of non-dip and dip sections in the energy band 6.12–14.75 keV along with their best-fits using a power-law+Lorentzian+constant model (shown in thick dashed lines). The wings or harmonics in the non-dip PDS are clearly visible but absent in the dip PDS, which is a characteristic feature observed when a type-B QPO moves into a type-A QPO. Bottom: similar PDSs in the lower energy band (3.68–5.71 keV) are shown. The Poisson noise is not subtracted.
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