Comparison of particle distributions as functions of the particle momenta. All electrons and positrons are used from the simulations. The distributions for 1D and 2D simulations at the simulation start, instability saturation, and the simulation end (top row). Comparison of the distribution difference between the simulation end and saturation time for 1D and 2D simulations (middle row). Comparison of the distribution difference between 1D and 2D simulations for the saturation time and simulation end (bottom row). The vertical dotted gray lines show selected positions of momenta where the distributions change significantly. The dashed gray lines show the initial distributions (top row) and a zero distribution difference (middle and bottom rows). (a) S1–1D + S1–2D. (b) S2–1D + S2–2D. (c) S3–1D + S3–2D.