**Table 1:** 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.
$\begin{table} \par\includegraphics[width=20.5cm,clip]{G1133_t1.eps} \end{table}$

	1 Introduction
	2 Observations and data analysis
	3 Discussion
	References