Effect of log g on the formation of C iii 5696 for T_eff = 30 500 K. Left: total radiative rates out of level 2s3p ¹P^o at log g = 3.25 (upper panel) and log g = 3.75 (lower panel) as a function of Rosseland opacity. Notice how the largest rate is for λ 884, and that this rate shows a qualitatively different behavior in the two models. The dotted lines indicate the C iii 5696 line formation region. Right: total radiative rates out of level 2s3d ¹D at log g = 3.25 (upper panel) and log g = 3.75 (lower panel).