\begin{table}%t1
\caption{Standard deviations and mean colors for comparison of~DENIS $I$-band with 
2MASS $J$-, $H$-, $K$-band.}
\label{sigcol}
%\centering
\par
\begin{tabular}{llll}
\hline
\hline
Comparison             &  $\sigma$  &  mean color  &  $n$            \\
\hline
$I$ vs. $J$    &  0.23       & $<J-I>~=-0.89 \pm 0.23$ & 16~998\\
$I$ vs. $H$    &  0.25       & $<H-I>~=-1.60 \pm 0.25$ & 16~989\\
$I$ vs. $K$    &  0.28       & $<K-I>~=-1.95 \pm 0.28$ & 17~014\\
\hline
\end{tabular}
\end{table}