\begin{table}%t1
      \caption{Mean magnitudes and discrepancies.}
         \label{Reduction}
      %\centering
\par
         \begin{tabular}{crrrrllr}
            \hline
            \hline
            $ID$ & $epoch$ & $N_{{\rm total}}$ & $N$ & $N/N_{{\rm total}}(\%)$ & 
            $\bar{m}$ & $\bar{m}_{2000}$ & $\bar{m} {-} \bar{m}_{2000}$ \\
            \hline
            1 & 137 & 1022 & 910 & 89 & 3.98 & 4.06 & --0.08 \\   
            2 & 964 & 1025 & 911 & 89 & 4.16 & 4.07 & 0.09 \\
            3 & 1437 & 1018 & 889 & 87 & 4.16 & 4.06 & 0.10 \\
            4 & 1572 & 777 & 658 & 85 & 4.27 & 4.08 & 0.19 \\
            5 & 1603 & $\sim$1200 & 949 & $\sim$79 & 4.42 & 4.26 & 0.16 \\
            6 & 1689 & $\sim$3000 & 1003 & $\sim$33 & 4.61 & 4.36 & 0.25 \\
            7 & 1843 & 3256 & 1946 & 60 & 5.03 & 4.81 & 0.22 \\                     
            \hline
         \end{tabular} 
   \end{table}