\begin{table}%t1
\par
\caption {\label{clumps}Properties of the envelope convection zones in our~20 and 
60~$\mso$ models of solar metallicity. These are the same models shown in the top panel of Figs.~\ref{20zsunsurf} and in~\ref{60zsunsurf}. The values in the table refer
to $t$~=~\ttwenty  for the 20~$\mso$ model and $t$~=~\tsixty for the 60~$\mso$ model.}
\renewcommand{\footnoterule}{}
%\centerline
 {\begin{tabular}{l   c c c c c c c c c }
\hline\hline
   $M$        \T  & Zone    &      $\hp$ & $\vca$  & $\Delta M_{\rm conv}$$^a$  & $\Delta M_{\rm top}$$^b$  & $N_{\rm cells}$$^c$  & $\tau_{\rm turn}$$^d$ &   $\tau_{\rm conv}$$^e$ & $ \dot{M}$ \\
 $M_{\odot}$ \T  &         & $R_{\odot}$ &  km~s$^{-1}$              & $M_{\odot}$             & $M_{\odot}$            &                  &       days          &  days     & $\mso ~\rm{ yr}^{-1}$ \\
\hline
20              & He      & 0.025      &   0.08       & $7.6\times10^{-9}$     &  $1.9\times10^{-9}$     & $1.8\times10^{5}$ &   2.5        &  38         &      $7.3\times10^{-8} $      \\
20              & Fe      & 0.08       &   2.40       & $3.6\times10^{-6}$     &  $5.8\times10^{-7}$     & $1.8\times10^{4}$  &   0.25       &  18~250  &  $7.3\times10^{-8}$   \\
60              & Fe      & 0.24       &   2.25       & $1.6\times10^{-5}$     &  $9.8\times10^{-7}$     & $8.5\times10^{3}$  &   0.83       &   1570    &  $3.7\times10^{-6}$      \\
\hline
\end{tabular}}
\par
\smallskip
$^a$ {Mass contained in the convective region.}
$^b$ {Mass in the radiative layer between the stellar surface and the upper boundary of the convective zone.}
$^c$ {Expected number of convective cells, $N_{\rm cells}:= (R_{\star}/H_{\rm P})^2$.}
$^d$ {Convective turnover time, $\tau_{\rm turn}:= H_{\rm P}/\vca$.}
$^e$ {Time that a piece of stellar material spends 
inside a convective region, $\tau_{\rm conv}:= \Delta M_{\rm conv}/\dot M$.}
\par
\end{table}