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\label{fig:kipp1} \label{20zsunsurf}  Evolution of the radial extent of the helium and iron convective regions (hatched) as function of time,   from the zero age main sequence to roughly the end of core hydrogen burning, for a 20$\mso$ star. The top of the plot  represents the stellar surface. Only the upper 1$\rso$ of the star is shown in the plot,