Angular distribution of the momenta of particles with Lorentz factors γ ⩾ 30 at times t = 56 τ _c0 (top panels), t = 66 τ _c0 (middle panels), and t = 84 τ _c0 (bottom panels) in simulation S2K025L shown in the Aitoff projection. The panels of the left and right show the particles near the current sheets at x = L _x /4 and x = 3 L _x /4, respectively. The plotted particles were selected from a random sample containing 5% of the particles in the simulation.