\begin{table}%t2


  \caption{\label{tab2}Maximum column densities and the respective band strength for the species identified in this work.}
  %\centering

  \begin{tabular}{l l l l l l}
  \hline \hline
  Position (cm$^{-1}$) & Molecule & $N$ (10$^{16}$ molecules cm$^{-2}$) & Fluence (10$^{12}$ cm$^{-2}$) & $A$ (10$^{-17}$ cm molecule$^{-1}$) & Reference \\
  \hline
  2311                 & C$^{18}$O$_{2}$ & 150                               & 0                             & 7.6                               & Gerakines et~al. (\cite{Gerakines95}) \\
  2088                 & C$^{18}$O       & 25                                & 2.5                           & 1.1                               & 
  Gerakines et~al. (\cite{Gerakines95}) \\
  2039                 & C$_{3}$         & 0.022                             & 2.5                           & 10                                & 
  Hutter et~al. (\cite{Hutter94})    \\
  2008                 & C$^{18}$O$_{3}$ & 1.3                               & 0.5                           & 0.54                              & 
  Gerakines et~al. (\cite{Gerakines96}) \\
  989                  & $^{18}$O$_{3}$  & 0.9                               & 2.5                           & 1.5                               & 
  Bennet et~al. (2005)    \\
  \hline
  \end{tabular}
\end{table}