\begin{table}%t1
%\centering
\par
\caption{\label{table:1}Observational circumstances.} 
\par
\begin{tabular}{cccccccc} 
\hline\hline \noalign{\smallskip}
\# & Date & $UT _{\rm start}$     &  $T_{\exp}$  & Airm. & Spec.  & Rot.  & Sol. an.\\
& &  &  & & slope  & phase & airm.\\
& &  (hh:mm) &  (s) & & (\%/10$^3~\AA$) &       &    \\
\hline  
1 & 2008 Nov. 27 &  23:39 &   8   &  1.07  & 1.5~$\pm$~0.5 & 0.018 & 1.04 \\
2 & 2008 Nov. 27 &  23:53 &   30  &  1.05  & 1.0~$\pm$~0.5 & 0.046 & 1.04 \\
3 & 2008 Nov. 28 &  00:49 &   40  &  1.01  & 1.4~$\pm$~0.5 & 0.161 & 1.04 \\
4 & 2008 Nov. 28 &  01:33 &   40  &  1.02  & 1.8~$\pm$~0.5 & 0.251 & 1.04 \\
5 & 2008 Nov. 28 &  02:23 &   40  &  1.07  & 2.2~$\pm$~0.5 & 0.353 & 1.04 \\
6 & 2008 Nov. 28 &  03:05 &   40  &  1.14  & 2.0~$\pm$~0.5 & 0.438 & 1.04 \\
7 & 2008 Nov. 28 &  03:54 &   40  &  1.30  & 2.1~$\pm$~0.5 & 0.538 & 1.04 \\
8 & 2008 Nov. 28 &  04:32 &   40  &  1.50  & 1.7~$\pm$~0.5 & 0.616 & 1.04 \\
9 & 2008 Nov. 29 &  22:18 &   40  &  1.23  & 0.7~$\pm$~0.5 & 0.731 & 1.02 \\
10 & 2008 Nov. 29 &  23:12 &  40  &  1.09  & 1.4~$\pm$~0.5 & 0.841 & 1.02 \\
11 & 2008 Nov. 29 &  23:13 &  30  &  1.09  & 1.6~$\pm$~0.5 & 0.843 & 1.02 \\
12 & 2008 Nov. 30 &  00:07 &  30  &  1.03  & 1.7~$\pm$~0.5 & 0.953 & 1.02 \\
13 & 2008 Nov. 30 &  00:57 &  40  &  1.01  & 1.7~$\pm$~0.5 & 0.056 & 1.02 \\
\hline
\end{tabular}
\tablefoot{For each spectrum we report the starting time of acquisition corrected for light-time, 
the exposure length, the airmass of Lutetia, the spectral slope 
computed between 0.6~$\mu$m and 0.75~$\mu$m, the coverage of the rotational phase,  and the airmass of the used solar analog.}
\end{table}