\begin{table}%t2
%\centering
\par
\caption{\label{atomic_mol_data}Atomic and molecular data taken from the L{\sc ambda} database  \citep{Lambda2005}.}
\small \begin{tabular}{lllll}
\hline\hline\noalign{\smallskip}
Species & \# Lev. & \# Lines & Collision & Reference\\
               &                &                & partner & \\
\hline\hline
C$^+$ & 2 & 1 & H & \citet{Launay1977} \\
             &     &      & e$^-$ & \citet{Wilson2002} \\
             &     &      &  o-H$_2$ & \citet{Flower1977}\\
             &     &      &  p-H$_2$ & \citet{Flower1977}\\
O & 3 & 3 & H & \citet{Launay1977} \\
    &     &    & e$^{-}$ & \citet{Bell1998} \\
    &    &     & o-H$_2$ & \citet{Jaquet1992}\\
    &   &     & p-H$_2$ & \citet{Jaquet1992}\\
    &    &    & H$^+$& Chambaud (1980)\tablefootmark{1} \\
CO   & 26 & 25 & H & \citet{Chu1975} \\
        &       &       & H$_2$ & \citet{Schinke1985} \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{1}{Private communication.}}
\end{table}