Relationship between accretion luminosity (L_acc) and the luminosities of Hβ (upper) and H8 (lower), all normalized by the solar luminosity L_⊙. The subscript “dereddened” denotes line luminosities additionally dereddened using the estimated local extinction. Red, blue, and green symbols correspond to the estimates in S (pure shock emission), S + BC (shock emission + BC), and S + BC–like (potentially explained by S + BC under a relaxed statistical criterion), respectively. Transparent symbols denote less-confident estimates (see Appendix C.4). Although they are individually less reliable, they may still provide useful information on the population trend, particularly near the fitting-grid boundary at large L_acc in these plots. When the mean value falls outside the plotting range, the corresponding symbol is placed at the edge of the plot. Open symbols indicate that another accepted mode exists for the same observation. The solid and dashed lines show the empirical L_acc–line luminosity relations derived from observations (J. M. Alcalá et al. 2017; solid line) and from shock-emission model predictions (Y. Aoyama et al. 2021; dashed line).