\begin{table}%t3
 
    \caption{\label{tab:abondances}Molecular column densities and abundances at 3 different
      positions of the PDR named "Cloud'', "IR~peak'' and "IR~edge''.
      Equatorial offsets refer to the Mosaic~2 map center given in Table~\ref{tab:pdb}. $(\delta x, \delta y)$ offsets refer to the coordinate
      system defined in Fig.~\ref{fig:maps2}. \HH{}~column densities have
      been derived from the 1.2\mm{} dust continuum emission using a dust
      temperature range of~20 to~40\K{} for the "Cloud'' position and~40      to~80\K{} for the IR~positions. Others column densities used LVG
      models with a representative set of densities and kinetic
      temperature. 1-$\sigma$ uncertainties thus reflect the systematics 
      due to the approximate knowledge of density and kinetic temperature. 
      Abundances are computed with respect to the number of protons, 
      \ie{} $[{\rm X}] = 0.5~N({\rm X})/N(\HH)$.}
    \begin{tabular}{lrrrr}
      \hline\hline
              & $\delta$RA & $\delta$Dec & $\delta x$ & $\delta y$ \\
      \hline
      Cloud   &  $+6''$ & $-4''$ &  $+24.9''$ & $-5.3''$ \\
      IR~peak &  $-6''$ & $-4''$ &  $+12.2''$ & $-2.4''$ \\
      IR~edge & $-12''$ & $-4''$ &   $+7.4''$ & $-1.0''$ \\
      \hline
    \end{tabular}
    \medskip{}
    \begin{tabular}{rlccc}
      \hline
      Quantity     & Unit           & \multicolumn{1}{c}{Cloud} & \multicolumn{1}{c}{IR~peak} & \multicolumn{1}{c}{IR~edge}      \\
      \hline
      $S_{1.2\mm}$ & mJy/Beam       &    $38 \pm 2$     &  $ 35 \pm 2 $     &    $12\pm  2 $    \\
      $N(\HH)$     & 10$^{21}$\pscm &  $ 27  \pm 9.5 $  & $10.5 \pm 4$      &   $3.6\pm  1.7$   \\ 
      $N(\CeiO)$   & 10$^{15}$\pscm &   $5.8 \pm 0.5$   &    $4 \pm 0.5$    &     $1\pm  0.3$   \\
      $N(\CCH)$    & 10$^{13}$\pscm &   $5.5 \pm 1$     &   $30 \pm 5 $     &    $11\pm  3$     \\
      $N(\cCCCHH)$ & 10$^{12}$\pscm &   $2.3 \pm 0.7$   &   $24 \pm 10$     &   $9.5\pm  5$     \\
      $N(\CCCCH)$  & 10$^{12}$\pscm &    $20 \pm 10$    &   $40 \pm 10$     &    $37\pm  10$    \\
      \hline
    \end{tabular}
    \medskip{}
    \begin{tabular}{rlccc}
      \hline
      Quantity     & Unit       & Cloud & IR~peak & IR~edge \\
      \hline
      $[\CeiO]$    & 10$^{-7}$  &  1.07 &     1.9 &     1.4 \\
      $[\CCH]$     & 10$^{-8}$  &  0.10 &     1.4 &     1.5 \\
      $[\cCCCHH]$  & 10$^{-10}$ &  0.43 &    11.4 &    13.2 \\
      $[\CCCCH]$   & 10$^{-9}$  &  0.37 &     1.9 &     5.2 \\
      \hline
    \end{tabular}
      \end{table}