\begin{table}%t1
\caption{The color--metallicity relations for 10 different colors.}
\label{colors}
%\begin{center}
\par
\begin{tabular}{l c l}\hline\hline
Color & $N$ & Relation \\ \hline
$V-I$ & 65 & [{Fe/H}] = $-$5.79 + 4.68 ($V-I$)\\ %\hline
$U-B$ & 72 & [{Fe/H}] = $-$1.91 + 3.22 ($U-I$)\\ %\hline
$B-V$ & 78 & [{Fe/H}] = $-$4.83 + 4.91 ($B-V$)\\ %\hline
$V-R$ & 55 & [{Fe/H}] = $-$5.93 + 9.82 ($V-R$)\\ %\hline
$U-V$ & 72 & [{Fe/H}] = $-$3.15 + 2.05 ($U-V$)\\ %\hline
$B-R$ & 55 & [{Fe/H}] = $-$5.49 + 3.58 ($B-R$)\\ %\hline
$B-I$ & 65 & [{Fe/H}] = $-$5.87 + 2.75 ($B-I$)\\ %\hline
$U-R$ & 55 & [{Fe/H}] = $-$3.61 + 1.71 ($U-R$)\\ %\hline
$U-I$ & 64 & [{Fe/H}] = $-$4.19 + 1.57 ($U-I$)\\ %\hline
$R-I$ & 54 & [{Fe/H}] = $-$4.41 + 6.39 ($R-I$)\\ \hline
\end{tabular}
%\end{center}
\par
\end{table}