Figure 15 shows a comparison of the emission spectrum at densities of 10 cm (panel a) and 10 cm (panel b) due to oxygen in the 0.5-1 keV energy range. The ionization parameter is log()=2 and the temperature is 10K. In the high density case the ratio of continuum to line emission is reduced, and the ratios of the He-like lines is changed from the familiar low-density case in which the forbidden/intercombination line ratio is large at low density to values 1 at high density.