Line luminosity as a function of accretion luminosity. Both quantities are normalized to the stellar luminosity. From top to bottom: [O i] 630 nm high-velocity component, [O i] 630 nm narrow low-velocity component, and H₂ 2.12 µm. Linear fits to the data are marked by the dashed lines. Analytical solutions and Pearson coefficients are also labeled. Upper limits are drawn with red arrows.