\begin{table}%t1
\caption{Observational parameters of the high-resolution measurements 
with the WSRT and the VLA. }
\label{tab_observing_log}
\small
%\centering
\par
\begin{tabular}{cccccccccc}\hline\hline
Instrument&Date&Configuration&$l$&$b$&$\Omega_{\rm HPBW}$&$\Theta_{\rm HPBW}$&$\delta v$&$\Delta \nu$&$\sigma_{rms}$\\
&[m:y]&&[$\deg$]&[$\deg$]&[$\deg$]&[$\arcsec$]&[km~s$^{-
1}$]&[MHz]&$[{\rm mJy~Beam}^{-1}]$\\\hline
WSRT&Feb. 2007&$2 \times 48$&348.5&75.8&0.5&$80 \times 180$ 
&0.5&2.5&9.9\\
&Feb. 2007&$2 \times 48$&196.9&28.6&0.5&$80 \times 120$&0.5&2.5&8.5 
\\\hline
VLA&Feb. 2007&DnC&49.4&--78.6&0.5&$100 \times 100$&1.3&1.56&10.6 
\\
&Feb. 2007&DnC&211.8&--32.1&0.5&$100 \times 100$&1.3&1.56&13.3 \\
\hline
\end{tabular}
\end{table}