\begin{table}%t2
\caption{The adopted star formation histories for the dSph~galaxies\protect studied in this paper.}\label{tab2}
%\centering
\small
\begin{tabular}{c|ccc|c}  
\hline\hline  
&\multicolumn{2}{c}{SFHs} & &  References\\
& $n$ &$t_{\rm B}$ (Gyr) &$d$(Gyr) \\
\hline
Sextans      & 1  &0        &8               &LM04\\
Sculptor     & 1  &0        &7               &Dolphin (\cite{Dolp02})\\
Sagittarius  & 1  &0        &13              &Dolphin (\cite{Dolp02})\\
Draco        & 1  &0        &4               &Aparicio et~al. (\cite{Aparic01}), \\
             &    &         &                &Dolphin et~al. (\cite{Dolp05})\\
Ursa Minor   & 1  &0        &3               &Carrera et~al. (\cite{Carr02}), \\
             &    &         &                &Dolphin et~al. (\cite{Dolp05})\\
Carina       & 4  &0/2/7/9  &2/2/2/2         &Rizzi et~al. (\cite{Rizz03})\\
\hline 
\end{tabular}
\end{table}