\begin{table}%t1
\caption{Parameters of the OVRO observations.}
\label{tobs}%\begin{center}
\par
{\begin{tabular}{lcccrccc}
\hline\hline
&&&\multicolumn{2}{c}{Synthesized beam} \\
\cline{4-5}
\multicolumn{1}{c}{Observation} &
\multicolumn{1}{c}{Configuration} &
\multicolumn{1}{c}{Frequency} &
\multicolumn{1}{c}{{\it HPBW}} &
\multicolumn{1}{c}{PA} &
\multicolumn{1}{c}{Bandwidth} &
\multicolumn{1}{c}{Spectral resolution}& 
\multicolumn{1}{c}{rms noise$^a$}\\
& & \multicolumn{1}{c}{(GHz)} &
\multicolumn{1}{c}{(arcsec)} &
\multicolumn{1}{c}{(deg)} &
\multicolumn{1}{c}{(MHz)} &
\multicolumn{1}{c}{(\kms)}& 
\multicolumn{1}{c}{(mJy~beam$^{-1}$)}
\\
\hline
2.7~mm continuum &L, C &112.53 &$6.3\times4.8$ &$-27$ &4000&$-$ &1.4 \\
CO (\juz) &L, C  &115.27 &$8.0\times6.3$ &$-29$ &22.5 &0.65 &45\\
C$^{18}$O (\juz) &L, C &109.78  &$8.0\times6.6$ &$-32$ &7.5 &0.68 &40\\
HC$_3$N (\jdo) &L, C  &109.17 &$8.1\times6.7$ &$-37$ &7.5 &0.69 &40\\
\hline  
\end{tabular}}
\par
$^a$ For the molecular line observations the 1$\sigma$ noise is per channel.
%\end{center}
\par
\end{table}