Fig. 2
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Workflow of filtering and cleaning steps to remove extragalactic contamination prior to asymmetry and periodicity analysis (Sect. 3.1), sources with too few epochs (Sect. 3.2), affected by a spurious scanangle (Sect. 3.3), outliers (Sect. 3.4), and, finally, sorting the sources based on their degree of variability (Sect. 3.5).
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