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Fig. 1.
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0.1 s binned light curves of 15 X-ray bursts from 4U 1820–30 observed by NICER in 0.5–10 keV are marked as red lines. The right axis shows the 3–10 keV light curves as black lines. The persistent emissions are regarded as background and subtracted. The gray shaded region mark the intervals used to extract PRE phase spectra.
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