\begin{table}%t2
%\centering
\caption{Rotation parameters between the ICRS and J2000.0.}
\label{tab2}
\begin{tabular}{llllll}
\hline\hline
Authors               & Method of  & $\epsilon_{x}$   & $\epsilon_{y}$     & $\gamma_{y}$ & $\Delta o - \gamma_{y}$ \\
                      & observation& (mas)            & (mas)              & (mas)        & (mas) \\
\hline
Chapront et~al. (2002)& LLR        & $-5.36\pm0.54$   & $17.70\pm 0.20$    & $40.83 \pm 0.46$ & $14.6 \pm 0.5$ \\
Mathews et~al. (2002) & VLBI       & $-6.819\pm0.015$ & $16.6171\pm0.0080$ & $38.328\pm0.018$  & -- \\
\hline
\end{tabular}
\end{table}