Parameter recovery for the radius ratio and surface brightness ratio from the timing and physics-based formulae (IJspeert et al. 2024b). Orange targets satisfy the selection condition (see main text for details) for the relevant variable (radius ratio or surface brightness ratio), while green targets satisfy the condition for both the radius ratio and the surface brightness ratio. From the original 14377 sample, 10409 targets satisfy the surface brightness condition, 9728 satisfy the radius ratio condition, and 7823 satisfy both conditions.