\begin{table}%t7
\caption{\label{nh3par}\nh\ line parameters from the fits to the \nh~(1, 1) magnetic hyperfine components.}
\small%\centerline
 {
\begin{tabular}{lcccc}
\hline\hline\noalign{\smallskip}
&\vel
&$\Delta~v^{a}$
&$A\tau_{\rm m}^{b}$
&$\tau_{\rm m}^{c}$\\
Source
&(\kms)
&(\kms)
&(K)
&\\
\hline
VLA~8A  &$-19.99\pm0.01$ &$0.8\pm0.1$ &11.04~$\pm$~0.32 &2.71~$\pm$~0.13  \\
VLA~8B	 &$-19.92\pm0.01$ &$0.9\pm0.1$ &\phn8.41~$\pm$~0.35 &2.12~$\pm$~0.16   \\
IRS~1	 &$-19.92\pm0.01$ &$0.9\pm0.1$ &\phn8.39~$\pm$~0.34 &2.11~$\pm$~0.15   \\
MM2	 &$-19.85\pm0.01$ &$0.7\pm0.1$ &\phn6.60~$\pm$~0.34 &4.40~$\pm$~0.37 \\
MM1	 &$-19.96\pm0.01$ &$0.7\pm0.1$ &16.34~$\pm$~0.54 &3.46~$\pm$~0.17 \\
SC	 &$-19.96\pm0.01$ &$0.6\pm0.1$ &10.08~$\pm$~0.49 &3.96~$\pm$~0.27\\
\hline
\end{tabular}}
\medskip
$^{a}$ Intrinsic line width ({\it FWHM}) of the magnetic hyperfine component.
$^{b}$ $A=f(J_{\nu}(T_{{\rm ex}})-J_{\nu}(T_{{\rm bg}}))$, where $f$ is the filling factor, $\Tex$ is the excitation temperature of the
transition, $T_{{\rm bg}}$ is the background radiation temperature, and $J_{\nu}(T)$ is the intensity in units of temperature,
$J_{\nu}(T)=(h\nu/k)/(\exp(h\nu/kT)-1)$.
$^{c}$ Optical depth of the main line obtained from the fit.  
\end{table}