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Fig. 1

Electron-impact excitation collision strength versus the impact energy for the transition 3s21S0–3p21S0 of Fe14 + . Full line: R-matrix (Fernández-Menchero et al. 2014b); ×: AS-DW (Fernández-Menchero et al. 2014b); +: AS-UDW (present work); □: FAC-DW (Landi 2011); ◇: UCL-DW (Christensen et al. 1985).
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