The EPIC 2–10 keV (top) and 0.2–2 keV (middle) background subtracted light curves folded over the best-fit period, with phase zero set at the minimum of the modulation in the total band folded light curve shown in Fig. 4. The (0.2–2 keV)/(2–10 keV) hardness ratio is shown in the bottom panel. The error bars represent the 1σ confidence level.
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