PF: pulsed fraction defined in Eq. (1). Swift errors are computed based on the Poisson uncertainty of the pulse profile and do not include calculations based on the period uncertainties, as a systematic uncertainty of 0.01 was added to the estimated Swift/XRT PF. The XMM-Newton PF is estimated from the profile presented in Fig. 1, and errors are estimated from the 1σ error in the derived period.
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