Fig. 2.
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Phase lags (left panels) and intrinsic coherence function (right panels) for NICER observations from 1200120263 to 120012070 of MAXI J1820+070 for the 0.3–2 keV and 2–12 keV energy bands. With a dashed red line, we depict the frequency of the imaginary QPO in each observation derived from the multi-Lorentzian fitting approach (see Sect. 4.1 for details).
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