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Fig. 5.


Correction of the one-sidereal day variations. From left to right: winters 2008 to 2011. One star is given as an example for each winter; the stars’ IDs are indicated. The lightcurves are phase-folded at a one sidereal day period. First row: initial lightcurve. Second row: split into different data sets. Each set is represented by a color and the recovered pattern is shown as a line of the same color. Third row: lightcurve after division by the patterns. Fourth row: identification of outliers, indicated in red. Fifth row: lightcurve with outliers removed. Sixth row: final lightcurve after applying all the photometric correction and data selection steps.

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