Fig. 6
Panel a: model line ratios of Fe XX 14.849 Å (black) and 14.824 Å (red) to the main transition at 14.283 Å, calculated by the thermal model in SPEX v3.03 (solid) and APEC v3.0.8 (dashed). Panel b: O VIII Lyδ to Lyα ratio as a function of temperature for the two thermal codes. The blue points in both figures show the value required to create a 1% excess above the continuum at 14.82 Å for a 2 keV plasma.
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