Temporal behavior of radial velocity and intensity of the 5 M_⊙ model st35gm04n048. Top panel: Spherical averages of the radial velocity as a function of radial distance and time. Bottom panel: Normalized intensity (luminosity seen by an observer) corresponding to the view in Fig. 10. The colored vertical lines (red, orange, green) at about t = 30 yr mark the instants selected for Figs. 10 and 11.