Fig. 4.
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Time lags (black circles) between multiband continuum light curves as a function of wavelength for the various methods described in Sect. 3. All lags are measured relative to variations at 4250 Å. The dashed blue lines show the best fit to the observed relation τ = τ0/ [(λ/λ0) β − y0] with τ0, β, and y0 as free parameters (these values are presented in Table 5).
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