Line ratio between the 170.96 nm, 3d92 D5∕2–3d84p2 F (1–38), and the 216.55 nm, 3d8(3F)4s 4 F9∕2–3d8(3F)4p 4 F (1–29), lines for temperatures between log Te = 2.5–4.5 K, and densities between 1 × 102 and 1 × 108 cm−3 for the shifted model. The dashed lines provide an upper and lower bound for the unshifted line ratio for varying density and temperature.
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