\begin{table}%ta1
%\centering
\par
\caption{\label{tbl:info}LO frequencies $\nu_{\rm{LO}}$, main beam efficiencies $\eta_{\rm{MB}}$ according to Eq.~(\ref{eq:ruze}), velocity resolution $\Delta \varv$ (for 0.5~MHz frequency resolution), and operational days~(OD) when observations were carried out.}
\vspace*{-2mm}
 \begin{tabular}{cccc}
\hline\hline\noalign{\smallskip}
$\nu_{\rm{LO}}$ & $\eta_{\rm{MB}}$ & $\Delta \varv$& OD \\
(GHz) & &(km~s$^{-1}$)&\\
\hline 
  564.476 &0.69 &0.27&292	\\
  614.763 &0.68 &0.24&292	\\
  758.772 &0.68 &0.20&297	\\
  975.087 &0.67 &0.15&293	\\
  995.481 &0.67 &0.15&293	\\
  1102.757&0.67 &0.14&294	\\
  1106.735&0.67 &0.14&294	\\
  1157.495&0.67 &0.13&296	\\
  1200.717&0.66 &0.12&296	\\
  1713.596&0.64 &0.09&298	\\
  1757.417&0.63 &0.09&298	\\
  1838.039&0.63 &0.08&298	\\
  1864.539&0.63 &0.08&298	\\
\hline
 \end{tabular}
% \vspace*{-2mm}
\end{table}