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Fig. 3


Upper panel: Chandra X-ray light curve (the same shown in Fig. 1) of the flare. Middle panel: hardness ratio (HR), defined as the ratio of events in the 3.0−8.0 keV band to events in the 0.5−3.0 keV, versus time. Lower panel: temperature of the hot plasma component during flare evolution. Red points mark the maximum temperature and the temperature measured at the time in which the count rate is maximum.

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