\begin{table}%T1
%\centering
\par
\caption{The summary of MMF data 1968--2001 (with no \mbox{normalization}).}
\label{tab1}
\begin{tabular}{lccrcc}
\hline\hline
Observatory&Years&$\Delta$ (G)&$N$&$S$ (G)&k\\
\hline
CrAO&1968--2001&0.15&1945&0.67&0.94\\
MWO&1970--1982&0.07&2457&0.67&0.94\\
WSO&1975--2001&0.05&7952&0.41&1.54\\
SSO&1982--1993&0.12&313&0.77&0.82\\
\hline
In all&1968--2001&--&12~667&--&--\\
\hline\end{tabular}
\end{table}