Initial AGB wind-envelope structures. The left-side axis is used with heavy particle (electron) densities drawn with a thick solid (dotted) line. The right-side axis is used with flow velocities drawn with a thin solid line. All properties are drawn as function of radius. All lines are drawn as histograms; individual gridpoints are visible in the innermost part of the envelope. The central-star mass is indicated in the panel. The large density trough at 10¹⁸cm is due to the last thermal pulse 40 000 yr before the star left the AGB.