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Fig. 9


Effective collision strengths for the dipole-allowed a) 2s22p3–2s2p4 (1–6), b) 2s22p3–2s2p4 (3–9), c) 2s22p3–2s2p4 (4–10), and d) 2s22p3–2s22p2(1D)3s (4 − 22) transitions as a function of electron temperature. Present results, solid curve; Ramsbottom & Bell (1997), solid rectangles.

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