Final power spectrum (using the pn detector) created from our 2018 XMM-Newton data (the final power spectrum from the 2015 XMM-Newton observation was reported in Rouco Escorial et al. 2017). A clear pulsation is visible at ∼0.277 Hz, which corresponds to the known NS spin frequency. Inset shows the pulse profiles obtained using the measured spin period during the 2015 (black, left axis) and 2018 (red, right axis) XMM-Newton observations. The count rates are normalised using the mean values of the count rates. Two cycles of each pulse are displayed for clarity and both pulse profiles are aligned using the peaks of the profiles. The blue dashed lines show a sinusoidal model to fit the pulse profiles using two harmonics.
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