Probability distribution for Ψ_d, computed as a density function from posterior samples. Top panel: equator-on view, showing the probability projected onto the sky plane. Bottom panel: pole-on view, constructed assumed spherical symmetry around the stellar spin axis. Darker colours indicate higher probability. Dashed black lines show angular separations from the stellar spin axis for visual reference, and the white dashed line marks the median value (33°. Since Ψ is an absolute angle, orientations in the bottom panels are directionally degenerate.