\begin{table}%t1
%\centering
\par
\caption{\label{tab:lines}List of lines.}
\vspace*{-3mm}
{\scriptsize
\begin{tabular}{lccccccc}
\hline\hline \noalign{\smallskip}
Molecule & Transition & $\nu$ (GHz) & $E_{\rm up}$ (K) & $n_{\rm crit}$\tablefootmark{a} (\cmcube) & $\sigma_{\rm rms}$ (mK) \\
\hline
H$_2$O & $1_{11}{-}0_{00}$ & 1113.343 & 53.4 & 1.7\ttp{8} & 40 \\
H$_2$O & $2_{02}{-}1_{11}$ & 987.927 & 100.8 & 2.1\ttp{8} & 50 \\
H$_2^{18}$O & $1_{11}{-}0_{00}$ & 1101.698 & 53.4 & 1.7\ttp{8} & 40 \\
\hline
  \end{tabular}}
  \vspace*{-2.5mm}
\tablefoot{\tablefoottext{a}{Values at 20~K from collision rates of \cite{grosjean2003}.}}
\vspace*{-3mm}
\end{table}