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Table 7

Best-fit parameters of the sinusoidal modulation fitting the optical/UV time-lags.

Parameters Best-fit 1 Best-fit 2

A (s) 161 ± 24 105 ± 24
B (s) 194 ± 25  −267 ± 43
P (days) 6593 ± 452 283.1 ± 0.6
t0 (days)  −1180 ± 481 239 ± 16
χ2(d.o.f.) 34.52(32) 35.57(32)

Notes. Uncertainties are at the 68% c.l. for a single parameter. In the second and third columns, we show the best-fit parameters for the modulation of 18 years and 283 days, respectively.

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