Fig. 3
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0.5–1 vs. 2–5 keV lag-frequency spectra of selected observations of MAXI J1820+070. The observations illustrate the diverse behaviour of soft (negative) lags during different phases of the outburst (as also reported in the insets). The solid red curve is the best-fit RELTRANS model. The blue arrow marks the frequency range used for the extraction of covariance spectra.
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