\begin{table}%t2
%\centering
\par
\caption{The formal (\cite{hoyt98}) and weighted annual averages of $R_{\rm{g}}$
   and their errors in 1790's.\label{Tab:year}}
\begin{tabular}{cccc}
\hline \hline
year & formal & weighted & $\sigma$\\
\hline
1790&61.5&57&12.5\\
1791&43.2&39.5&5.3\\
1792&42&19.2&7.3\\
1793&41&12.4&5.3\\
1794&30.2&23.4&5.2\\
1795&15.7&18.8&3\\
1796&13.7&12.9&3.8\\
\hline  
\end{tabular}
\end{table}