Fig. 2.
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Lomb-Scargle periodogram of the source XMMU J173029.8–330920. The top panel is for data from the XMM-Newton EPIC-pn detector, and the bottom panel is for the NuSTAR FPMA detector. In both cases, a significant peak around 1.918 × 10−3 Hz is visible, which corresponds to the period of 521 s. The small insects show the 3–10 keV folded light curve. The red horizontal lines indicate the 3σ detection significance.
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