\begin{table}%t1
\caption{\label{Tab:Obs}Details of the imaging observations used in this
  work.}
%\centerline
 {\begin{tabular}{llllll}
\hline
\hline
\noalign{\smallskip}
Date & $\lambda_{\rm central}$ & $\Delta\lambda$ & $N^{{a}}$ & NDIT$^{{b}}$ & DIT$^{{c}}$\\
 &  [$\mu$m]  &   [$\mu$m] &  & & [s] \\
\hline
29 April 2006 & 1.66 & 0.33 & 32 & 28 & 2  \\
\hline
\end{tabular}}
\par
\smallskip
$^{{a}}$  Number of (dithered) exposures
$^{{b}}$  Number of integrations that were averaged on-line by the read-out
  electronics
$^{c}$ Detector integration time. The total integration time of each observation amounts to $N\times {\rm NDIT} \times \rm DIT$.
 \end{table}