\begin{table}%t2
\caption{\label{table:NGC1817modval}Method validation for BN04's NGC~1817 data (units of~$\mu$ and~$\sigma$ are mas~yr$^{-1}$).}             
%\centering
\par
\begin{tabular}{l c c c c c c}
\hline\hline \noalign{\smallskip}
Work& $n_c$ &$\mu_{\alpha}\cos\delta$ & $\mu_{\delta}$ & $\sigma_{\mu_{\alpha}\cos\delta}$ & $\sigma_{\mu_{\delta}}$ & $\rho$ \\
\hline
Our	     & $0.252$   	&$0.25$& $-0.94$ 	     & & & \\ 
method & $\pm0.02$&$\pm0.11$& $\pm0.07$ & & & \\
		& 	           		& $2.33$& $-4.08$   & $5.11$       & $5.93$       & $-0.04$ \\ 
		& 		  		& $\pm0.24$& $\pm0.27$ & $\pm0.18$ & $\pm0.20$ &$\pm0.04$ \\      
&&&&&&\\
BN04  & $0.261$   	& $0.29$& $-0.96$      	& & & \\ 
		&$\pm0.02$	& $\pm0.10$& $\pm0.07$ & & & \\ 
		& 			  	& $2.29$& $-4.25$      & $5.69$       & $6.38$       & $-0.08$ \\ 
		& 		  		& $\pm0.02$& $\pm0.27$ & $\pm0.02$ & $\pm0.14$ &$\pm0.03$ \\
\hline
\end{tabular}
\vspace*{5mm}
\end{table}