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Fig. 4.
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Folding search for periodicity in the 5–40 keV NuSTAR/FPMA light curve of the obsid. 30701025002 (left panel) and obsid. 30301009002 (right panel). The horizontal dashed line indicates the χ2 value of 34.72 at which we have the 99.73% confidence level for a single trial, corresponding to a significance of 3σ.
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