X-ray/optical cross correlations for short-term variations. The solid, dashed, and dotted lines were calculated from the data of 4.8 × 103s < t < 7.5 × 103s, 1.0 × 104s < t < 1.4 × 104s, and 1.6 × 104s < t < 1.9 × 104s, respectively. The upper and lower panels show correlation functions on long and short time scales. No significant correlation can be seen.
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