Intensities of electromagnetic waves by one plasma bunch interaction as seen from the distance d = 1 kpc, assuming a pulsar with a rotation period T_pulsar = 0.25 s, a frequency bandwidth Δf = 20 MHz, γ_s = 100, a time interval in the simulation reference frame, and neglecting radiation transfer effects. The intensity profile can be understood as cuts for arbitrary frequency along the polar angle in the frequency–angle space (see Fig. 4). We assume that the center of the emission cone crosses the observer at the time t(θ = 0) = 0.