\begin{table}%t6
%\begin{center}
\par
  \caption{\label{table_pola} Mean polarimetric properties, taking
    into account only HPOL data after JD~2~490~000.}
\begin{tabular}{ccccc}
  \hline\noalign{\smallskip}
  \hline
Spectral & \multicolumn{2}{c}{Pol.~degree}  & \multicolumn{2}{c}{Pol.~angle} \\
Band & Mean [\%] & $\sigma$  & Mean [$\deg$]& $\sigma$ \\
%
\hline 
$U$ & 0.99 & 0.14 & 32.3 & 3.5 \\
$B$ & 1.59 & 0.08 & 31.6 & 1.6 \\
$V$ & 1.46 & 0.08 & 31.3 & 1.5 \\
$R$ & 1.30 & 0.06 & 31.3 & 1.2 \\
$I$ & 1.18 & 0.06 & 31.5 & 1.5 \\
\hline\noalign{\smallskip}
\end{tabular}
%\end{center}
\par
\end{table}