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Fig. 2.


Time lag of the 9–15 keV photons with respect to the 2–6 keV ones as a function of the spectral index Γ of the hard X-rays for the 2006–2007 outburst. The blue circles give the observations and the different symbols give the model results, as follows: black crosses – low-luminosity HS, red diamonds – HS, and green squares – HIMS.

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