\begin{table}%t2
\caption{\label{tab2}Major diameter statistics. The first two columns give the
samples and the number of galaxies. The next three columns give
the mean value, standard deviation ($\pm$sd), and standard error
($\pm$se) of the galaxy samples for $a \geq1\arcmin$,
$a  \geq45\arcsec$, $a \geq30\arcsec$, and all. The last column
gives the cluster position angle (cPA) in the galactic coordinate
system. The cPA  is estimated using the least-square fit method (see
Fig.~\ref{fig1}c).}
\small%\centering
\par
\begin{tabular}{llllll}
\hline\hline
Samples                & $N$ & Mean        &  $\pm$sd  &  $\pm$se    &  cPA    \\
\hline \noalign{\smallskip}
  $a \geq 1\arcmin  $ & 52  & 1.50\arcmin   &  23\arcsec  &  3.9\arcsec   &  3\degr   \\
  $a \geq 45\arcsec $ & 126 &  69\arcsec    &  26\arcsec  &  2.3\arcsec   &  7\degr   \\
  $a \geq 30\arcsec $ & 298 &  48\arcsec    &  25\arcsec  &  1.4\arcsec   &  22\degr  \\
  all                  & 366 &  42\arcsec    &  25\arcsec  &  1.3\arcsec   &  18\degr  \\
\hline
\end{tabular}
\end{table}