\begin{table}%t1
%\begin{center}
\par
  \caption{\textrm{Hierarchy of galaxies extracted from the original SDSS
    DR5 spectroscopic galaxy sample within $z=0.04$}\label{subsample_table}}
    \begin{tabular}{r r r r}
      \hline\hline
      \multicolumn{2}{c}{\bf Sample} & \multicolumn{2}{c}{\bf Subsample} \\
      \multicolumn{2}{r}{High signal-to-noise galaxies [20~632]} & {SFGs [18~350]} & {AGN [2 282]} \\
      \multicolumn{2}{r}{Low signal-to-noise galaxies [8 703]} & {SFGs [6 000]} & {AGN [2 703]} \\
      \multicolumn{2}{r}{Unclassified galaxies [17~409]} & {-} & {-} \\
      \hline
       \multicolumn{2}{r}{\bf All SDSS DR5 Galaxies [44~041]} & {} & {}  \\
      \hline
    \end{tabular}
  %\end{center}
\par
\end{table}