Comparison of the synthesized broadband UV spectra against the observations (orange triangles) used by Bruls (1993) to make the opacity fudge factors. The solid black and green lines were computed with Fe treated in NLTE, and Fe, Si, Al and Mg treated in NLTE, respectively. The dashed black line was computed with Fe in NLTE after removing the UV fudge factors. The LTE equivalent from Fig. 11 is not plotted here because the UV continuum is not important for the formation of the line wings in LTE.