XMM-Newton/pn light curve of Fermi J1544–0639. Bins of 1 ks are used. Top panel: count rate light curve in the 0.5–2 keV range. Middle panel: count rate light curve in the 2–10 keV range. Bottom panel: hardness ratio (2–10/0.5–2 keV) light curve. The vertical dashed lines separate the three intervals (A, B, C) defined for the spectral analysis. The solid horizontal lines correspond to the average hardness ratio for each interval.
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