Six typical local field-line structures of B_⊥ (types 1 to 6) as found in the reconnection region at t = 9. Panels (a)–(f) depict the field lines of B_⊥ on the MPP of selected grid positions as labeled by black triangle markers in panel (g). Different colors correspond to different types. The distributions of B_⊥ = |B_⊥| are also plotted with a gray color map. In panel (g), to give a clear picture, we only plot the grids with θ_eig larger than a threshold value. For types 1–3, the threshold is set as 30°; for types 4–5, the threshold is 5°.