Upper row: radiative accelerations (solid lines) and gravity (dotted lines); center row: wind velocities (dashed lines) and diffusion velocities toward the exterior (solid lines) and toward the interior (dotted lines); lower row: interior concentrations as a fraction of original ones. These quantities are shown at four different ages for a 0.8 M⊙ model with Ṁ = 10-12 M⊙ yr-1. The vertical lines indicate the position of the bottom of the SCZ. The ages are identified in the figure.
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