Comparison of BBQSORS with LRDs at z  < 4.5 from A. de Graaff et al. (2025) and the XRD from R. E. Hviding et al. (2026) in the λ_V – T_BB, L_BB – T_BB, and L_Hα – L_BB planes. Here, λ_V represents the wavelength where the V-shaped feature emerges. In the left panel, the solid line indicates the Balmer limit. In the middle panel, the solid line shows the expected L_BB – T_BB relation for a fiducial LRD-like photospheric radius (K. Inayoshi & L. C. Ho 2025), with dashed lines indicating offsets of ±1 dex. In the right panel, the dashed line represents the 1:1 relation and the solid line shows the same relation shifted by −1.2 dex.