Fig. 2.
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Lomb-Scargle of the full 75 ks of NICER data with a light curve time resolution of 1 s. There are no statistical features of the Lomb-Scargle periodogram that are not biased by the light curve sampling, as shown by the NICER window function Lomb-Scargle for comparison. Thus, the NICER data also do not show a sign of an orbital period.
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