Two typical proton trajectories from the many particle simulations in the fan model. Proton “1” is represented by a thin line with initial position (0.86,0.41,0.30), and proton “2” by a thick line with initial position (0.8,0.003,0.6). The parameters are λ = 0.75, B_s = α = 10, η = 10^-6. The solid lines are representative magnetic field lines (seeded from the top of the spine axis and projected into the 2D planes) and the arrows show the direction and relative magnitude of the electric drift velocity. a) In the x − y plane, where the electric drift arrows are from the edge of the current sheet z = z_η. b) In the x − z plane close to the current sheet, where the electric drift arrows are plotted on y = 0. The initial positions are not shown in this plane.