X-ray flux vs. pulse phase correlation for the 2004 and the two 2008 outbursts. All three outbursts follow a correlation between flux and phase which is consistent in all three cases, within the statistical errors. The correlation has been fit with a linear relation between flux and pulse phase. The pulse phase shifts by almost 0.2 cycles during 2004 and by ~0.1 cycle during 2008, for both outburst episodes. The fit parameters and the χ ² of the fit are reported in Table 6.