\begin{table}%t13
%\centering
\small
\caption{Sensitivities of Fe abundances to variations in 
the atmospheric parameters for typical stars in the three clusters.\label{sens}}
\begin{tabular}{llllllllllllll}
\hline
\hline
Star &$\sigma_{T\rm{eff}}$ &$\sigma_{\log g}$ &$\sigma_{\xi}$  \\
&$\Delta$\teff~=~$\pm100$~K & $\Delta{\log g}=\pm0.2$ dex & $\Delta{\xi}=\pm0.15$ km s$^{-1}$\\
\hline 
c9 (NGC~3960) & +0.09/$-$0.06&+0.01/0.00 &$-$0.05/+0.06 \\
17 (Be~32) &+0.09/$-$0.07&+0.01/0.00&$-$0.05/+0.06\\
542 (NGC~2660) &+0.09/$-$0.07&+0.01/0.00&$-$0.05/+0.06\\
\hline
\end{tabular}
\end{table}