Fig. 3
Two stretches of XMM-Newton light curves and color ratios for OBS2 and OBS4. The light curves are binned to 20 s and smoothed over two points. The rms errors are indicated taken from point to point fluctuations, with the same smoothing. The color ratios have been scaled by 5 × for visual clarity. Occasional flare aggregates are obvious in the light curves. The lower plots in the two panels disclose the color variations only over timescales of ≳ 0.6 ks.
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