Forward Monte Carlo mapping between the Rayleigh width of the true mutual inclination (σ_ψ) and that of the minimum mutual inclination (σ_ΔI). The black curve is obtained from simulations with 10⁵ systems, while the blue points show the median and 68% intervals from repeated realizations with N = 19, corresponding to the sample size of this work. The red dashed line marks the observed value, σ_ΔI = 15﹩\mathop{.}\limits^{{\unicode{x000b0}}}﹩8.