cycles, consistent with the 2002 and 2005 pulse phase behavior.

This phenomenology relating the 1 Hz QPO rms amplitude and the pulse phases might suggest a link between the presence of the 1 Hz QPO and the accretion flow onto the neutron star surface. However, due to the sparse sampling of the observations and the small number of jumps observed, this link remains to be confirmed in future observations.

Dependence of 401 Hz pulsation on the 1 Hz phase {#peakvalley}
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The 1 Hz modulation might affect the magnetic channeling during the re-flaring state. Possible differences in the pulse properties can be unveiled by analyzing the pulsations coming from different phases of the 1 Hz modulation. Since the modulation has a frequency that changes with time, it is hard to unambiguously define its phase.

We therefore used a crude but simple approach, defining “peaks” and “valleys” of the 1 Hz modulation in the lightcurve relative to the average flux. We first calculated the average X-ray flux per observation. Then we split the X-ray lightcurve into an upper half and a lower half containing peaks and valleys, respectively. We checked that this method was properly dividing the lightcurve by a visual 