Fig. 4.
Lag distributions of the QPO frequencies between 2–4 keV and 5–10 keV bands. The main QPO frequency and the first upper harmonic frequency display, on average, soft and hard lags, respectively, when the main QPO frequency is above 2 Hz. When the QPO frequency is below 2 Hz, the average lag at the main QPO frequency vanishes, and the first upper harmonic QPO frequency shows hard lags.
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