NuSTAR combined FPMA and FPMB light curve (3–30 keV) folded on the best-fitting period of P = 275.12 s. The count rate has been normalised by dividing it by the mean count rate of 0.313 count s−1 (indicated by the red dashed line). The green dotted line shows the best-fitting model, which consists of a fundamental and one harmonic at twice the frequency.
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