Times Δt spent by the models within the velocity intervals ΔV_HWHM = 1 km s^-1 and  km s^-1. The V_HWHM bins are broken down into M(5007) intervals as indicated by the different shades. The ΔṘ_out histogram serves only for comparison and is not broken down into magnitude intervals. Shown are the three 0.625 M_⊙ sequences with Z = Z_GD (left), Z = Z_GD/3 (middle), and Z = Z_GD/10 (right) whose velocity and brightness evolution are also seen in the Figs. 26 and 31. The maximum post-AGB age considered is 5000 years. The Δt for the faintest magnitudes are lower limits only because of this time limit.