\begin{table}%t1
%%%\centering
\par
\caption{Observations of Comet Hale-Bopp. $n$:
number of comet spectra per night, $r_{\rm h}$ and $\Delta$: heliocentric and
geocentric distances, $\beta$: phase angle, $\Delta\psi$: spatial
scale per pixel, $\Delta\lambda$: wavelength scale per pixel, $x$: slit
width. Negative $r_{\rm h}$ indicates observations before perihelion on 
April~1,~1997.\label{obs}}
$$
\begin{tabular}{lcccrlcccc} \hline\hline
 & & $r_{\rm h}$ & $\Delta$ & & & & $\Delta\psi$ & $\Delta\lambda$ & \\
\raisebox{1.5ex}[-1.5ex]{Date} & \raisebox{1.5ex}[-1.5ex]{$n$} & [AU]
& [AU] & \raisebox{1.5ex}[-1.5ex]{$\beta\:[^\circ]$} &
\raisebox{1.5ex}[-1.5ex]{Telescope} &
\raisebox{1.5ex}[-1.5ex]{Instrument} & [\arcsec/pix.] & [\AA/pix.] &
\raisebox{1.5ex}[-1.5ex]{$\times$ [\arcsec]} \\ \hline
\par
1996.04.25/26 & 1 & $-4.60$ & 4.29 & 12.4 & Danish 1.5~m & DFOSC & 0.39 &
3.02 & 2.0 \\
1996.04.26/27 & 5$^\dagger$ & $-4.59$ & 4.27 & 12.4 & Danish 1.5~m &
DFOSC & 0.39 & 3.02 & 2.0 \\
1996.06.24/25 & 3 & $-3.98$ & 2.99 & 3.9  & Danish 1.5~m & DFOSC & 0.39 &
3.03 & 2.0 \\
1996.08.19/20$^{\ast}$ & 2 &$-3.38$ & 2.77 & 15.2 & Danish 1.5~m & DFOSC &
0.39 & 3.02 & 2.5 \\
1996.08.18/19 & 2 & $-3.38$ & 2.76 & 15.1 & Danish 1.5~m & DFOSC & 0.39 &
3.02 & 1.0 \\
1996.08.23/24 & 2 & $-3.33$ & 2.78 & 16.1 & Danish 1.5~m & DFOSC & 0.39 &
3.02 & 2.5 \\
1996.10.02/03 & 1 & $-2.86$ & 2.99 & 19.5 & Danish 1.5~m & DFOSC & 0.39 &
3.03 & 2.5 \\
1996.10.03/04 & 1 & $-2.85$ & 3.00 & 19.5 & Danish 1.5~m & DFOSC & 0.39 &
3.03 & 2.5 \\ 
1997.09.20/21$^{\ast\ast}$ & 0 & 2.78 & 3.07 & 18.9 & ESO 2.2~m &
EFOSC2 &  0.16 & 1.95 & 2.0 \\
1997.09.29/30$^{\ast}$ & 2 & 2.89 & 3.10 & 18.8 & ESO 2.2~m & EFOSC2 & 0.16
& 1.95 & 1.5 \\
1997.09.30/10.1. & 2 & 2.90 & 3.11 & 18.8 & ESO 2.2~m & EFOSC2 & 0.16 & 1.95
& 1.5 \\
1997.11.23/24$^{\ast}$ & 4$^\dagger$ & 3.51 & 3.39 & 16.2 & ESO 1.5~m & B\&C & 0.82 & 1.89 & 2.4 \\
1997.12.06/07 & 4$^\dagger$ & 3.66 & 3.50 & 15.6 & Danish 1.5~m & DFOSC & 0.39 & 3.05 & 1.5 \\
1997.12.07/08$^{\ast}$ & 4 & 3.67 & 3.51 & 15.6 & Danish 1.5~m &
DFOSC & 0.39 & 3.05 & 1.5 \\
1997.12.19/20 & 5$^{\dagger}$ & 3.78 & 3.62 & 15.0 & ESO 1.5~m & B\&C & 0.82 & 1.89 &
2.4 \\
1998.01.20/21 & 3 & 4.14 & 4.00 & 13.8 & ESO 1.5~m & B\&C & 0.82 & 1.88 & 2.4 \\
1998.01.21/22 & 4 & 4.15 & 4.02 & 13.7 & Danish 1.5~m & DFOSC & 0.39 & 3.04 &
2.0 \\
1998.01.22/23 & 3 & 4.16 & 4.03 & 13.7 & Danish 1.5~m & DFOSC & 0.39 & 3.04 &
2.0 \\
1998.03.17/18 & 3 & 4.71 & 4.75 & 12.1 & Danish 1.5~m & DFOSC & 0.39 & 3.05 &
2.0 \\
1998.03.21/22 & 5 & 4.75 & 4.81 & 12.0 & ESO 1.5~m & B\&C & 0.82 & 1.88 & 2.4 \\
1998.08.05/06 & 1 & 6.05 & 6.21 & 9.4 & ESO 1.5~m & B\&C & 0.82 & 1.89 & 1.6 \\
1998.11.23/24 & 3 & 7.01 & 7.07 & 8.0 & ESO 3.6~m & EFOSC 2 & 0.16 & 0.97 & 2.0 \\
1998.11.24/25 & 2$^{\dagger}$ & 7.02 & 7.08 & 8.0 & ESO 3.6~m & EFOSC 2 & 0.16 & 0.97 & 2.0 \\
1999.01.13/14 & 6$^{\dagger}$ & 7.44 & 7.50 & 7.5 & ESO 3.6~m & EFOSC 2 & 0.16 & 1.94 & 2.0 \\
1999.01.14/15 & 2 & 7.44 & 7.50 & 7.5 & ESO 3.6~m & EFOSC 2 & 0.16 & 1.95 & 2.0 \\
1999.03.13/14 & 2 & 7.92 & 7.38 & 7.2 & ESO 3.6~m & EFOSC 2 & 0.16 & 1.95 & 2.0 \\
1999.11.12/13 & 2 & 9.78 & 9.89 & 5.7 & VLT UT1 & FORS 1 & 0.20 & 5.33 & 2.0 \\
2000.04.05/06$^{\ast\ast\ast}$ & 0 & 10.81 & 10.84 & 5.3  & VLT UT1 & FORS
1 & 0.20 & 5.33 & 2.0 \\
2000.09.28/29 & 5 & 12.01 & 12.04 & 4.8 & VLT UT1 & FORS 1 & 0.20 & 2.61 & 2.0 \\
2000.09.29/30 & 3 & 12.02 & 12.06 & 4.8 & VLT UT1 & FORS 1 & 0.20 & 2.61 & 2.0 \\
2001.01.20/21 & 5 & 12.75 & 12.95 & 4.3 & VLT UT1 & FORS 1 & 0.20 & 2.61 & 2.0 \\
2001.01.25/26 & 5 & 12.78 & 12.97 & 4.3 & VLT UT1 & FORS 1 & 0.20 & 2.61 &
2.0 \\ \hline 
\end{tabular}  
$$
\begin{flushleft}
$^{\ast}$ Night not photometric, only used for
reddening determination. $^{\ast\ast}$ No flux calibration, night not used.\\
$^{\ast\ast\ast}$ Magellan cloud in background, night not used.\\
$^{\dagger}$ Slit orientations along projected solar direction and
perpendicular to it.
\end{flushleft}
\end{table}