\begin{table}%t1
 \caption {\label{tab:filters}Main characteristics of the filters/polarizers available on
the two Iqueye filter wheels.}
  %\centering
\par
 \begin{tabular}{ccccc}
  \hline\hline
  Position & Wheel 1 & Peak (nm)/{\it FWHM} (nm)  & Wheel 2 & Peak (nm)/{\it FWHM} (nm) \\
  \hline
  1 & B & 433/101 & Neutral 1 & -- \\
  2 & V  & 531/82 & Neutral 3 & -- \\
  3 & R & 747/234 & HeII & 468/2 \\
  4 & IR & 817/179 & OI & 630/2 \\
  5 & O[III] & 501/1.31 & Pol Vis & Peak extinction ratio $>$ 1:1000 \\
  6 & H$\alpha$ & 656/3 & Pol UV & Peak extinction ratio $>$ 1:100~000 \\
  7 & Shutter & -- & Neutral 2 & -- \\
  8 & Clear & -- & clear & -- \\
  \hline
 \end{tabular}
\end{table}