Fig. 2
LRT main fluctuations and some of their correlation functions. Top left panel: the fluxes of Q0957+561A (shifted forwards in time in 417 d; filled circles) and Q0957+561B (open circles) in the g band. Top right panel: the AB cross-correlation (solid line), and the average of the AA and BB autocorrelations (shifted by +417 d; dashed line) in the g band for α = 6 d. Bottom left panel: the fluxes of Q0957+561A (shifted forwards in time in 417 d; filled squares) and Q0957+561B (open squares) in the r band. Bottom right panel: the AB cross-correlation (solid line), and the average of the AA and BB autocorrelations (shifted by +417 d; dashed line) in the r band for α = 9 d.
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