\begin{table}%T8
\caption{\label{t:tab6}Model error budget.}
%\centering
\par
\begin{tabular}{lcc}
\hline\hline
Error source    & Distribution & Limits       \\
                &              & (Gyr)        \\
\hline
Convection      & Flat         & $-0.4$, 0.4  \\
Code            & Flat         & $-0.4$, 0.4  \\
Micr. Diffusion & Gaussian     & 0.4 at $-0.4$ \\
Solar $M_V$     & Flat         & $-0.3$, 0.3  \\
\hline
\end{tabular}
\end{table}