Fig. 8
UDCFs between B and R bands light curves on August 14 (blue filled circles), November 30 (red filled squares), December 1 (green filled triangles), and December 2 (black crosses) in 2007. Error bars are omitted for clarity. The UDCFs peak at zero lag, and the corresponding correlation coefficient is r = 0.955 (August 14), 0.982 (November 30), 0.993 (December 1), and 0.981 (December 2), respectively.
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