Top row: synthetic profiles of the Fe xxv line blend as predicted by the model of Rauw et al. (2016, see also text). Bottom: variation of the integrated fluxes of the synthetic line profiles (filled symbols) as a function of orbital phase. The synthetic fluxes were scaled to match the observed emission measure of the hard plasma component at φ = 0.000. The measured fluxes at φ = 0.946 and 0.055 are shown by the open symbols. An upper limit on the flux at φ = 0.000 is also shown.