Fig. 6.
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Phase lag of the imaginary QPO as a function of QPO frequency. The inclination (high or low) of each source is inferred from X-ray reflection fitting. The phase lags are computed between the 2 − 5 keV (reference band) and 5 − 12 keV (subject band) energy bands. For AT2019wey, MAXI J1348–630, MAXI J1820+070, and Cygnus X–1, we use NICER data, while for Swift J1727.8–1613 we use XMM-Newton data.
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