\begin{table}%t3
\caption{\label{numball}Number of Mg~{\sc ii} systems and redshift paths.}  
%\centering
\par
\begin{tabular}{lccc}
\hline
\hline
&&& \\[-8pt]
$W_{\rm r}(\lambda2796)$ & $>$0.3~\AA & $>$1~\AA & $>0.3$ and $<$1 \AA \\ 
\hline 
$\langle z_{\rm abs}\rangle$&1.34&1.11&1.57\\
\hline 
Redshift path    & 13.79 & 13.94 & 13.79 \\
\hline
&&& \\[-8pt]
 $N^{\rm MgII}_{\rm obs}$ (UVES sample)& 18   & 9   & 9   \\
&&& \\[-8pt]
\hline
&&& \\[-8pt]
$N^{\rm MgII}_{\rm exp}$&$11.98~(\pm3.46 $)&$4.83~(\pm2.20$)&$7.21~(\pm2.68 $)\\
\citep{Nestor2005}  &&&\\
\hline
&&& \\[-8pt]
$N^{\rm MgII}_{\rm exp}$&&$4.00~(\pm2.00$)&\\
(Prochter et al. 2006)  &&&\\
\hline
\end{tabular}
\end{table}