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Fig. 1

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Top: collision strength for the 3s2 3p61S0–3s2 3p5 4s 1P1 transition of Fe ix. Squares with dashed line from present results. Histogram from Storey et al. (2002). Bottom: thermally averaged collision strength for the 3s2 3p61S0–3s2 3p5 4s 1P1 transition. Solid line with squares from present results. Diamonds from Storey et al. (2002).

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