Diverse mosaic of ray-traced flux tubes, illustrating how geometry controls local transfer quantities and observables. In each row (one fireball setup), the columns show normalized color maps of observed delay Δt_obs, surface normal zenith cosine ﹩\hat{{\boldsymbol{k}}}\cdot {\hat{n}}_{{ \mathcal S }}﹩, photon magnetic cosine ﹩\hat{{\boldsymbol{k}}}\cdot \hat{B}﹩, photon magnetic azimuth angle ﹩\cos {\phi }_{kB}﹩, accumulated polarization-averaged splitting optical depth ﹩\mathrm{log}{\tau }_{{\rm{ave}}}﹩, gravitational redshift factor 1 + z, and local field strength ∣B∣. Across rows, only the surface footpoint ellipse parameters are varied, with M = 1.5 M_⊙ and r_⋆ = 12 km fixed. The first seven rows are viewing angle θ_v = 60°, and the last row is θ_v = 90°. The fifth and sixth cases with limited footpoint area near the pole seem to be most compatible with spectral phenomenology of magnetar SBs (see Section 3).