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Fig. 3

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Long-term variability of S4 0954+65 (upper panel). In the middle panel, the wavelet timescales (red dots) and a three-point running average (blue line), showing the sudden increase starting from March 2008. The structure function timescales are shown in the lower panel. The red vertical line divides the observing sessions into two phases characterized by remarkably different variability characteristics.

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