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Fig. 2.
Panel a: MAXI J1820+070 outburst light curves at the initial stages as determined by the Swift/BAT (black error bars) and the Swift/XRT (blue error bars) in the 15–50 keV and 0.5–10 keV bands. Panel b: evolution of the photon index as seen by the Swift/XRT. The vertical line marks MJD 58222.
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