Fig. 10
Cross-correlation of the EPIC pn (X-ray) and OM (UV) light curves with 1 s time resolution. The CCFs are displayed for SS Cyg, RU Peg, WW Cet, T Leo, and VW Hyi from the top to the bottom of the figure. The correlation coefficient is normalized to a maximum value of 1. The two-component Lorenzian fits are shown as solid black lines (except for SS Cyg where a single Lorentzian was used). The reduced χ2 values are 0.8, 0.4, 0.45, 1.2, and 0.45 from the top to the bottom panels of the figure.
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