\begin{table}%t1
   %\centering
\par
\caption{Observational conditions for the two runs, compared with the conditions of epoch 4 for the NACO-SDI $\epsilon$ Eri campaign for reference (Janson et~al. \cite{Janson2007}).}
         \label{nbtab1}
\begin{tabular}{llll}
         \hline
            \hline
          ~ & NB4.05, 1   & NB4.05, 2   & SDI \\
         \hline
            \noalign{\smallskip}
Main date          & 17 Dec. 2007 & 28 Dec. 2007 & 1 Jan. 2006 \\
Mean seeing$^a$    & 1.42$''$    & 0.65$''$    & 0.82$''$   \\
% Strehl in K      & 55.0\%      & 62.4\%      & 55.3\%     \\
Mean Strehl$^b$    & 84.3\%      & 87.4\%      & 33.8\%     \\
Mean humidity      & 6\%         & 32\%        & 38\%       \\
Coherence time$^a$ & 2.6 ms      & 3.4 ms      & 3.8 ms     \\
% Corr. time       & 4.7 s       & 3.0 s       & 12.0 s     \\
Frames             & 19          & 19          & 52         \\
(per angle)        &      ~      &     ~       &       ~    \\
DIT                & 1.0 s       & 1.0 s       & 1.0 s      \\
NDIT               & 61          & 61          & 86         \\
Tot. time          & 1159 s      & 1159 s      & 4472 s     \\
(per angle)        &      ~      &     ~       &       ~    \\
 \hline
\end{tabular}
\begin{list}{}{}
\item[$^a$] Values given by the atmospheric seeing monitor at a wavelength of 500 nm.
\item[$^b$] Strehl ratio given by the AO system, rescaled to the observing wavelengths.
\end{list}
\end{table}