Models with different X-ray fluxes compared to the IUE spectrum (black line) of HD 218195. All the other parameters are fixed. These models have the following log (L_X ∕ L_BOL): −7.96 (blue dashed), −7.49 (green dashed), −7.00 (solid red), −6.49 (solid green), and −6.00 (solid blue). Our final model for HD 218195 is shown in red line (typical X-ray luminosity for O stars). We note how the modeling of N V λ1240 is sensitive to the inclusion of X-Rays, while Si IV λλ1394,1403 and C IV λλ1548,1551 are almost unchanged.