Upper plot: effective collision strength as a function of logarithmic electron temperature (Te in K) for the 2s22p 2P1/2–2s2p22D3/2 transition, lower plot: same for 2s22p 2P1/2–2s2p22S1/2. The solid black line represents the results of M1, the green line with circles is the effective collision strengths of Zhang et al. (1994) and the blue line with squares illustrates the results of Liang et al. (2012).
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