\begin{table}%T1
   %\centering
\par
      \caption{Observational data. 
$r$ is the heliocentric distance.
$m_{\rm r}$ is the heliocentric visual magnitude.
2dc is the McDonald 2D-coude spectrograph, SOFIN
and UVES are 
the high-resolution spectrographs at, respectively, the NOT and       ESO VLT telescopes.
$n$ is the number of spectra obtained, for 
a total exposure time of Exp. Extent is
the size of the zone explored 
at the distance of the comet.
$R$ is the instrumental resolving power. Fwhm
is the measured width of the CN lines. 
}
         \label{observ}
\includegraphics[width=20.5cm,clip]{G1133_t1.eps}
   \end{table}