Normalized toroidal magnetic field B_φ/B_0, down for asymmetric simulation with Ω_down/Ω_up = 4 and B_0, down/B_0, up = 0.25, in the configuration with identical spins and aligned (panel a) or anti-aligned (panel b) magnetic moments. The simulation has reached a steady state. The young (resp. old) pulsar is at the top (resp. bottom). The poloidal magnetic field lines are depicted as black solid lines. The black dashed (resp. dotted) line denotes the light cylinder of the bottom (resp. top) pulsar. The stellar separation is fixed at a = 1.25 R_LC.