Fig. 3.
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Phase lags and intrinsic coherence function of region Z3 of the HID of Cygnus X-1 computed between the 3−5 keV and 5−12 keV energy bands. No evidence of the coherence drop or the cliff of the phase lags at ∼1.5 Hz is apparent (see Fig. 2). The horizontal lines in each panel indicate the reference levels for zero phase lag and unity coherence, respectively.
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