Typical trajectory for a particle, here an electron. Note the Speiser-like oscillatory motion inside the current sheet. Axis scales are given in cell numbers, with 9 cells representing one initial electron inertial length d_e. Dot colors are the particle Lorentz factor. Solid lines are projections onto the x-y, y-z, and z-x planes. The y direction is not described in the simulations and is here reconstructed on the basis of an invariance of the electromagnetic fields along y.