Fig. 3
Electron-impact excitation effective collision strengths versus the electron temperature for some selected transitions and targets, as in Fig. 2. Full line: present work; dashed line: C2+Berrington et al. (1989), Mg8+Del Zanna et al. (2008), and Fe22+Chidichimo et al. (2005); dotted line: C2+Mitnik et al. (2003).
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