Fig. 4.
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Energy dependence of the pulsations in MAXI J1957+032. The XMM-Newton/PN dataset is split into 16 significance-optimised bands spanning 0.5–10.0 keV. In each band, the signal is modelled with a pure sinusoidal function (fundamental harmonic) at the NS spin period. Panel (a): Relative phase of the fundamental as a function of energy. Panel (b): Fractional amplitude of the fundamental as a function of energy.
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