Variation with orbital phase of the spectral fit parameters and fluxes (see Table 6 for details). Black dots correspond to XMM-Newton spectra, the cyan filled triangle to the Chandra spectrum, and magenta crosses to binned Swift spectra (see text). Left panel: absorption, normalisation factors, and observed fluxes. Right panel: ISM-absorption corrected fluxes, in both the 0.5–2.5 keV and 2.5–10.0 keV energy bands, as a function of phase (top) and separation (bottom).