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Fig. 11
Electron-impact excitation effective collision strengths for dipole allowed and Born transitions 
1s21S0 − 1sns 1S0 of the ion C4 +. Curved lines: R-matrix; ⋄: distorted wave calculation basis n = 1 − 8; vertical line: peak abundance temperature for electron collisional plasmas (Mazzotta et al. 1998).
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