Particle phase space distributions for the pulsar with ι = 0° along the magnetic dipole axis at x = 0 at the end of the simulation time. Black and green lines: Average particle distributions of electrons f_e, av(p) and positrons f_p, av(p), respectively, in a distance range of y = 800–1400 m. Top: Particle number density. Bottom: Charge density. The white regions have a zero charge density distribution (if f(r, p)> 0), or there are no particles (if f(r, p)=0).