We calculate line profiles using a 4-parameter model
3 parameters describe the spatial and velocity distribution of the emission: R o is the minimum radius of X-ray emission, while b describes the acceleration of the wind and q parameterizes the radial dependence of the filling factor.
1 parameter, t* describes the level of continuum absorption in the overlying wind.
A wind terminal velocity is assumed based on UV observations, and the calculated line profile is convolved with the appropriate instrument-response function for each line.