Fig. 9.
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Time lag and coherence of observation 0100320110 of Cyg X-1 at Γ ∼ 2.3. Time lags at hard X-ray energies (blue) show power law-like hard lags at a high coherence. In soft X-rays (red), the time lags are predominantly soft with a relatively low amplitude at a coherence > 0.9 in the 0.3–5 Hz range. At lower frequencies, the coherence is reduced.
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