Fig. 1.

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Light-curve segment of TT Ari, showing a typical time interval in its high state. The top panel shows a three-day span from October 2012, while the middle panel shows segment of a 0.4 days (9.6 hours) within the same time interval. The bottom panel shows the residual data from the spline interpolation. Removing the superhump modulation reveals other brightness variations, including QPOs.
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