\begin{table}%t1
%\centering
\par
\caption{\label{table_transitions}Lines of H$_2$O observed with \textit{Herschel}/HIFI in \source.}
\begin{tabular}{lccccccccc} 
\hline\hline  \noalign{\smallskip}
Water species & Frequency &  $E_u$  &  $T_{\textrm{sys}}$  & $t_{\rm int}$  &  $\delta \nu$ &  rms  &  Beam  &  $\eta_{\textrm{mb}}$  &cont. \\   
& (GHz) & (K)  &  (K)    & (s) & (kHz) & (K) & (\arcsec) & & (K)\\
\hline \noalign{\smallskip}
\hoA    & 552.020960   &    61.0  &       73  &  158 & 250 & 0.06 & 40.0 & 0.72 & 0.35 \\
\hoB    & 987.926764  &  100.8  &       347 &   386 & 500 & 0.07 & 23.0  & 0.71 & 1.4 \\     
\hoC    & 1101.698256 &    53.4  &       351 &   601 & 500 & 0.09 & 20.0  & 0.71 &2.15 \\
\hoD    & 1113.342964 &    53.4  &       351 &   601 & 500 & 0.09 & 20.0  & 0.71 &2.15  \\
\hoE    & 1661.007637 &  194.1  & 1609 & 1164 & 250 & 0.25 & 13.5  & 0.69  & 5.5 \\
\hoF    & 1669.904775 &  114.4  & 1609 & 1164 & 250 & 0.25 & 13.5  & 0.69  & 5.5 \\
\hline   
\end{tabular}
\end{table}