\begin{table}%t1
%\centering
\par
\caption{\label{table1}Stellar populations of red and blue disk LSBGs.}
\begin{tabular}{cccc}
\hline \hline
 \noalign{\smallskip}
\multicolumn{2}{c}{SSP}  & \multicolumn{1}{c}{blue LSBGs}  & \multicolumn{1}{c}{red LSBGs}   \\
\hline
age($t$, Gyr) & young $(t \leq 0.5)$ & 58.8 & 38.9  \\
&intermediate $(0.64 \leq t \leq 2.5)$ & 35.3 &  27.8 \\
&old $(t \geq 5.0)$ &  5.9 &   33.3 \\
\hline
$Z/Z_{\odot}$ &0.2 & 58.8 & 35.3\\
&1 &  29.4 &  47.1 \\
&2.5 &  11.8 &  17.6 \\
\hline
\end{tabular}
\tablefoot{Results of fitting the combined spectra by using STARLIGHT with 45 SSPs from Bruzual \& Charlot (\cite{Bruzual2003}). The contributed light fractions in three age-bins (young populations with age ${\leq} 5 \times 10^8$~yr, intermediate populations with $6.4 \times 10^8~{\rm yr} \leq {\rm age} \leq 2.5 \times 10^9$~yr and old populations with age ${\geq} 5.0 \times 10^9$~yr) and three metallicities (0.2, 1.0 and 2.5~$Z_\odot$) are presented. It is noticed that the percent fractions here are slightly different from the $x_j$ component output by STARLIGHT directly.}\vspace*{-1.5mm}
\end{table}