Fig. 7.
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ZTF light curves of the repeating (a) AT2019aalc and (b) AT2020afhd, binned to 14 days. Bottom panel: Colour evolution corrected for Galactic extinction and host galaxy contributions. For (a) AT2019aalc the shaded grey regions indicate light curve segments corresponding to flux dips before the flares identified by Bayesian blocks at significance levels of 34σ (first) and 8σ (second). For (b) AT2020afhd the 30σ flux excess is shown in red.
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