Posterior distribution of the 3D spin–orbit angle ψ, derived by assuming a uniform prior on cos i_⋆ (random stellar spin axis orientation). The purple and blue density contours represent the posterior distributions of ψ under the projected obliquity constraints from the RMR analysis and the classical RM analysis respectively, while the solid curves mark the 1, 2, and 3σ credible regions. The red point indicates the ψ value obtained from the RMR G2 fit. The side panel shows the 1D marginal posteriors of ψ. Both distributions consistently favor a polar orbital configuration.