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Fig. 1.
Top: long-term light curve of GX 339-4 showing four major X-ray oubutbursts. Middle: hardness-intensity diagram for the 2006–2007 outburst. Bottom: time lag between 9–15 keV photons with respect to 2–6 keV photons against the photon index of the hard power-law continuum. All four outbursts are included.
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