Event on 26 February 2011. From top to bottom: (1) dynamic spectrum of the type III radio burst (SWAVES/STA), (2) a comparison between the observed spike intensity and the modeled omnidirectional time profile (red). Blue and black: time profiles of electrons streaming away and towards the Sun, respectively. (3) and (4) pitch angle distributions (PADs) of observed and simulated spike electrons, (5) magnetic field measured by MAG/STA. The observed time profiles and PAD are not shifted. A point-like source, an impulsive injection close to the Sun, and a reflecting boundary at a radial distance of 1.3 AU from the Sun is considered. The diffusion coefficient is equal to zero if |μ| ≤ 0.2 (no scattering through 90 degrees, here μ is the pitch angle cosine).