Source fluxes corrected for the absorption (0.5–10 keV) versus the orbital phase. For the XMM-Newton observations we report two values (slightly shifted in orbital phase to better show the error bars) obtained from the two different continuum models adopted, the power law and the apec model. We note that for two Chandra observations the uncertainties reported in this plot are simply due to the uncertainties in the count rate assuming a fixed spectral shape (see text), while it is only in the Chandra obsID 24086 (at ϕ = 0.53) that the flux and its uncertainty are the outcome of the spectral analysis.