Fig. 4.
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Phase lags and coherence function for each region of the HID of AT2019wey for the 0.3–2 keV and 2–12 keV bands. The vertical dashed black line marks the frequency of the imaginary QPO (see text) where the phase-lag cliff and coherence-function dip occur. The colour coding used in the frequency spectra for the different zones matches that of Fig. 1.
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