Radiative acceleration profiles from XEVOL for a number of elements in the 4.7 ﹩\;{M}_{\odot }﹩ model T150KD1K-3. Profiles are shown for ages 2 Myr (green), 50 Myr (gray), and 85 Myr (red). The horizontal dotted curves show the run of log g through the envelope, while vertical lines show the limits of envelope convection zones for He II (dotted) and iron group elements (solid, if present).