\begin{table}%t1
\caption{NH$_3$ line parameters$^{\rm a)}$.}\label{tab1}
\small
%\centerline
 {\begin{tabular}{l c r r @{\ } r}
\hline\hline
Line & $\int{\tau {\rm d}V}$ & $V$  & \multicolumn{2}{c}{$\Delta V_{1/2}$} \\
 & \multicolumn{4}{c}{(km~s$^{-1}$)}                        \\
\hline
NH$_3$ (1,~1)  & 0.661~(0.120)         &  +9.0~(0.1) & 27.3&(0.3)        \\
              & 0.895~(0.164)         &  +8.6~(0.5) & 34.9&(1.2)        \\
NH$_3$ (2,~2)  & 0.599~(0.109)         &  +7.4~(0.2) & 33.6&(0.5)        \\
              & 0.429~(0.082)         & +10.5~(0.4) & 20.8&(1.0)        \\
NH$_3$ (3, 3)  & 0.330~(0.050)         &  +8.6~(0.1) & 15.6&(0.3)        \\
NH$_3$ (4,~4)  & 0.137~(0.021)         &  +8.4~(0.2) & 17.3&(0.4)        \\
              & 0.105~(0.022)         &  +9.1~(0.7) & 14.7&(1.7)        \\
NH$_3$ (5,5)  & 0.101~(0.016)         &  +8.3~(0.3) & 16.9&(0.6)        \\
              & 0.101~(0.017)         &  +8.7~(0.5) & 20.6&(1.3)        \\
NH$_3$ (6,~6)  & 0.111~(0.017)         &  +8.1~(0.2) & 20.4&(0.6)        \\
              & 0.091~(0.040)         &  +8.5~(0.6) & 14.8&(1.4)        \\
NH$_3$ (7,~7)  & 0.035~(0.006)         & +10.9~(0.4) & 13.4&(0.9)        \\
NH$_3$ (8,~8)  & 0.029~(0.006)         &  +8.5~(0.6) & 14.8&(1.4)        \\
NH$_3$ (9,~9)  & 0.037~(0.007)         &  +8.8~(0.7) & 20.7&(1.6)        \\
NH$_3$ (10,~10)& 0.024~(0.005)         & +10.2~(2.0) & 36.9&(5.0)        \\
\hline
\end{tabular}}
\medskip
$^{\rm a)}$ From Gaussian fits adopting $z=0.88~582$ and assuming that the continuum source covering factor is $f_{\rm c}=1$. Standard deviations are given in parentheses. In cases in which a line was measured twice, the upper line refers to data taken in 2003 (see Sect.~2). The errors in the integrated optical depths include a 15\% calibration uncertainty, a 10\% uncertainty due to interference in the (1,~1) and (2,~2) spectra, and the standard deviation from the Gaussian fit. For $V$ and $\Delta V_{1/2}$, standard deviations were obtained from Gaussian fits alone.
\end{table}