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Fig. B.1
Level population ratio for the first four excited levels (level indices 2–5) of the Fe isonuclear sequence from He-like Fe xxv to Ne-like Fe xvii for collisional ionized equilibrium (CIE) plasma, using SPEXACT v3.04 (solid line) and CHIANTI v8.0.8 (dashed line). The CHIANTI atomic database v8.0.6 is used.
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