\begin{table}%t4
\caption{OH line observations of comets at MPIfR, 17 May 2004.
\label{OH_obs_table}}
%\centerline
{\begin{tabular}{cccccc}
\hline\hline
Transition & Frequency &  $T_{\rm peak}$ & $v_0$ & $FWHM = \delta v$ &
Line area $^a$  \\
$F_u \rightarrow F_l$  & [MHz] &  [mK] & [km s$^{-1}$] & [km s$^{-1}$] &
[mJy$~$km s$^{-1}$] \\
\hline
%  & & & &   & \\[-3mm]
\multicolumn{6}{l}{Comet C/2001 Q4 (NEAT): 17 May 2004 ($\Delta t$~=~12 min)}  \\ 
1 $\rightarrow$ 1 & 1665.4018 &  72 $^b$ & -- & -- & --   \\
2 $\rightarrow$ 2 & 1667.3590 &  119 & --0.16~$\pm$~0.26 & 2.06~$\pm$~0.55 &
130~$\pm$~31  \\
%  & & &  & & \\[-3mm]
\multicolumn{6}{l}{Comet C/2002 T7 (LINEAR): 17 May 2004 ($\Delta t$~=~16 min)} \\
1 $\rightarrow$ 1 & 1665.4018 & 99 & 0.54~$\pm$~0.23 & 2.69~$\pm$~0.36 &
142~$\pm$~23    \\
2 $\rightarrow$ 2 & 1667.3590 & 175 & 0.44~$\pm$~0.22 & 2.18~$\pm$~0.47 &
203~$\pm$~39  \\
\hline
\end{tabular}}
\par
\smallskip
$^a$ {$\int T_{\scriptscriptstyle{MB}}\; {\rm d}v$
(MPIfR gain: 2.0 K/Jy at 1665/1667 MHz).}\\
$^b$ {$T_{3\sigma}$.}
\end{table}