\begin{table}%t11 
\caption{\label{t11}Standard deviations for the different orders of the adjustments in
spherical harmonics (in mas).}
%\centering
\par
\begin{tabular}{lllllllllll}
\hline\hline
$n$ & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 15 \\ \hline
$\sigma (res_{\alpha })$ & 75.91 & 72.71 & 70.1 & 68.57 & 66.53 & 64.86 & 
63.29 & 62.32 & 61.19 & 56.08 \\ 
$\sigma (res_{\delta })$ & 77.57 & 77.07 & 76.18 & 72.56 & 71.6 & 70.59 & 
69.34 & 67.98 & 66.95 & 62.36 \\ \hline
\end{tabular}
\end{table}