\begin{table}%T1
%\centering
\par
  \caption{\label{tab:wavs} DOT filter specification.}
  \begin{tabular}{lcccc}
  \hline\hline
    designation   & $\lambda$ (\AA) & width (\AA) & type & tuning \\
  \hline
    blue continuum & 4320  &  6   & interference & fixed     \\
    red continuum  & 6540  &  3   & interference & tiltable  \\
    G~band         & 4305  & 10   & interference & fixed     \\
    \CaIIH\        & 3968  & 1.35 & interference & tiltable  \\
    \Halpha\       & 6563  & 0.25 & Lyot         & tunable   \\ 
    \BaII\         & 4554  & 0.08 & Lyot         & tunable   \\
  \hline
  \end{tabular}
\end{table}