Top panel: total best-fitting theoretical model, i.e. a power law plus blackbody plus reflected emission that is absorbed by Galactic absorption, an intrinsic neutral partially covering absorber, and an intrinsic highly ionised redshifted absorber; the strong feature at ~ 0.5 keV is due to Galactic oxygen absorption. Bottom panel: the effect of the highly ionised redshifted absorber on the power law emission alone is plotted; the strongest absorption lines are labelled.