\begin{table}%t6 
%\centering
\par
\caption {\label{tabres1L}Same as Table~\ref{tabres2L} for a frequency accuracy of 0.3~$\mu$Hz.}
\begin{tabular}{cccc} \hline\hline
Nf of modes  & 20 & 40 & 60 \\
\hline
 $\delta L /L$  with $\delta \nu$ & 0.09 & 0.05 & 0.03\\
 $\delta L /L$  with $\delta_{\rm sls}$ & $>$0.1 & $>$0.1 & $>$0.1\\
\hline
\end{tabular}
 \end{table}