Comparison between the PIC and dipole (GJ-like) baseline magnetospheres on three orthogonal slices aligned with the simulation axes for PSR J1856-3754. From top to bottom: B_x, B_y, and B_z slices, respectively. For each slice, the four panels show (from left to right): (1) PIC-fit model, (2) dipole baseline, (3) stabilized vector-relative logarithmic contrast Δ_vec defined in Equation (A3), and (4) cosine similarity ﹩\cos \chi ﹩ defined in Equation (A4). All coordinates are in units of R_LC, and all diagnostics are evaluated at rotation phase 0° on identical grids.