\begin{table}%T2
 %\centering
\par
 \caption{Estimation of the halo WD density based on the sample revised by  Salim et~al.\ (\cite{salim2004}).}
 \label{tab:density1}
\par
% \begin{footnotesize}
\begin{tabular}{rcccccl} \hline\hline
\par
Confid. & \multicolumn{2}{c}{$\psi(V_{\alpha},V_{\delta})$} &
\multicolumn{2}{c}{$h(V_{\alpha},V_{\delta})$} &
\multicolumn{2}{c}{$t(V_{\alpha},V_{\delta}|r)$}\\
level & WDs & $\rho_{\rm WD}$ ($M_{\odot}$ pc$^{-3}$) & WDs &
$\rho_{\rm WD}$
($M_{\odot}$ pc$^{-3}$) & WDs & $\rho_{\rm WD}$ ($M_{\odot}$ pc$^{-3}$) \\
 \hline
99\% & 19  & $(1.8\pm 0.6)\times10^{-5}$ & 17 & $(1.6\pm 0.6)\times10^{-5}$ &  16 & $(1.5\pm0.6)\times10^{-5}$\\
%\hline
95\% & 28  & $(3.3\pm 0.8)\times10^{-5}$ & 18 & $(1.8\pm 0.6)\times10^{-5}$ &  18 & $(1.9 \pm0.6)\times10^{-5}$\\
\hline
\par
\end{tabular}
% \end{footnotesize}
\end{table}