Timing analysis of the black hole candidate Swift J1727.8–1613: Detection of a dip-like feature in the high-energy cross spectrum

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Fig. 3.

Representative power spectra and cross spectrum of Swift J1727.8–1613 in the normal state. The LE 2–10 keV PDS (red), the HE 28–200 keV PDS (blue), and the modulus of the cross spectrum of the HE data with respect to the LE data (gray), corresponding to the observations between the black dotted vertical lines in Fig. 2.

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