Fig. 7.

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Upper panel: evolution of the RMS with energy. The data points in red and black correspond to simultaneous observations conducted by NICER and NuSTAR on July 14, 2021 (NICER: 4647012001; NuSTAR: 90701323002). The green points show the RMS spectrum of NuSTAR from cross-power density spectra (CPDS). Bottom panel: joint fitting of the PDS in 6 − 8 keV. The black and red points show the PDS of NICER and CPDS of NuSTAR, separately.
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