\begin{table}%t3
%\centering
\par
\caption{\label{tab:color}Colors of the NSDs and their host spheroids.}
\par
\begin{tabular}{@{}lccccccccc@{}}
\hline
\hline
\noalign{\smallskip}
Color & \multicolumn{2}{c}{NGC~4458} & 
  \multicolumn{2}{c}{NGC~4478} & \multicolumn{2}{c}{NGC~4570}\\
      &  NSD & Spheroid & NSD & Spheroid & NSD & Spheroid \\
\hline
\noalign{\smallskip}
$U-B$ &   ...  &  ...  & ...   & ... & 1.1 & 0.8  \\
$B-V$ &   0.6  &  1.0  & 0.8   & 1.1 & 0.9 & 1.0  \\
$V-I$ &   1.4  &  1.1  & 1.2   & 1.1 & 1.5 & 1.2  \\
 \noalign{\smallskip}
   \hline
\end{tabular}
%%\end{center}
\par
%\begin{minipage}{9 cm}
%\begin{small}
\tablefoot{The conversion to the Johnson system has been calculated
  as $U-B = [{  F336W-F475W}]-0.21$; $B-V = [{ 
      F475W-F555W}]+0.36$; $V-I = [{  F555W-F814W}]-0.05$.}
%\end{small}
%\end{minipage}
\end{table}