Variation of ion fraction with the ionisation parameter, log ξ for the MHD model of μ = 0.0674 along LOS of i = 21°. Ion fraction drops rapidly at higher ionisation, and at log ξ = 6.0 Fe XXVI becomes less than 10% of Fe, whereas Fe XXV becomes almost zero. Essentially, no absorption will take place for log ξ ≳ 6.0, for these ions. Distance from the black hole is shown in the upper x-axis. We use log ξ = 6.0 as a marker to start the XSTAR computation (Chakravorty et al. 2013).