Fig. 3

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Lomb–Scargle periodogram for source (black) and background (red) light curves. The ~670s and ~335 s peaks from GX 301–2, which are visible in the background light curve, are not present in the source light curve and do not overlap the pulsed signal from SRGA J124404.1–632232/SRGU J124403.8–632231.
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