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Fig. 4
Top: Lomb-Scargle periodogram of the “flaring” part of EXO 2030+375 light curve (between MJD 55 518.5 and 55 521.5). The peak around ~ 0.3 d is clearly seen. Bottom: “Flaring” part of the light curve folded with best period found from the periodogram (0.293 d).
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