\begin{table}%t2
\caption{\label{tab:simu_para}Parameters used for generating the two $N$-body simulations.}
\par
%\centering
\par
\begin{tabular}{c c c c c c c}
\hline \hline \noalign{\smallskip}
      Simulation  & $L_{\mbox{\scriptsize box}}/\Mpc$ &
      $N_{\mbox{\scriptsize par}}$ & $m_{\mbox{\scriptsize par}}/\Msun$
      & $N_{\mbox{\scriptsize map}}$&  $A_{\mbox{\scriptsize
          map}}/(\mbox{deg})^2$ \\[2pt] 
          \hline \noalign{\smallskip}
      Virgo & 141.3 & $256^3$ & $1.4 \times 10^{10}$ & 200 & 0.25 \\
      Gems & 150.0 & $256^3$ & $1.4 \times 10^{10}$ & 220 & 16.00 \\ 
      \hline
\end{tabular}
\end{table}