Fig. 4.
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PSDs of the NuSTAR observations, shown in red for N1 and blue for N2. For comparison the black data points indicate the results obtained by Heindl et al. (1999). The vertical solid orange lines highlight the spin frequency of the NS and its higher harmonics. The vertical dashed lines mark two additional peaks at 1.6 and 2.6 times the NS spin frequency.
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