\begin{table}%T6
\par
\caption{\label{epidemicf}Correction of $m_{21}$ to the scale of Nan\c{c}ay. This table gives 
the the zero-point shift and the mean error
for the different radiotelescope (Col.~1). By its adoption as a standard, the Nan\c{c}ay
radiotelescope ($t=1$) has $b=0$ and its standard deviation is~$\sigma=0.24$. The full table is available in the electronic version of the journal.}
%\centering
\par
\begin{tabular}{rrrrr}
\hline\hline
 $t$ &$ b \pm \sigma_b$ & $\sigma$ &$n$& $N_{\rm s}$\\
\hline
      7&$  0.052\pm  0.016$&  0.393&   647&  4182\\
      9&$ -0.086\pm  0.013$&  0.415&  1043&  6413\\
      3&$  0.051\pm  0.012$&  0.260&   467& 12813\\
       &   ...             &  ...  &      &      \\
       &   ...             &  ...  &      &      \\
       &   ...             &  ...  &      &      \\
\hline
\end{tabular}
\end{table}