\begin{table}%t2
\caption{\label{tab2}Least-squares multiplex gain for each data set. The output 
$S/N$ ratios are calculated from the \footnotesize{LSD}\normalsize\   process.}
%\centering
\par
\begin{tabular}{lcccc}
\hline
\hline\noalign{\smallskip}
Data Set & Input & LSD output & Gain & Effective \\
       & $S/N$ ratio & $S/N$ ratio & $S/N$ ratio& No. of lines\\
\noalign{\smallskip}\hline\noalign{\smallskip} 
KNPO 24th  & 65 & 1790 & 27.7 & 1711\\
KNPO 25th  & 73 & 2038 & 27.9 & 1711\\
KNPO 26th  & 74 & 2052 & 27.8 & 1711\\
KNPO 27th  & 78 & 2163 & 27.9 & 1711\\
MSO 29th  &  86& 3656 & 42.3 & 2249\\
MSO 30th  &  92& 3861 & 42.2 & 2249\\
MSO 01th  &  83& 3539 & 42.4 & 2249\\
MSO 02th  &  59& 2489 & 41.9 & 2249\\
MSO 03th  &  87& 3634 & 41.6 & 2249\\
\hline
\end{tabular}
\end{table}