\begin{table}%t1
%\centering
\par
\caption{\label{table_sample}Beam-averaged molecular column densities.}
\begin{tabular}{llllll} 
\hline \hline \noalign{\smallskip}
Species &   Transition &   Wavelength & $E_u$ & Intensity\tablefootmark{a} &  Column density\\
& & (microns) &  (K) & (10$^{-6}$~erg~s$^{-1}$~cm$^{-2}$~sr$^{-1}$) &    (10$^{15}$~cm$^{-2}$)\\
\hline\noalign{\smallskip}
C$^{18}$O &   $J=7\rightarrow 6$ &   390.2 &   147.5 & 2.6[1.1] & 7.7[24,3.8]\tablefootmark{b}\\
C$^{18}$O &                                    $J=8\rightarrow 7$ &   341.5 &   189.6 & 3.3[1.1] & 15[72,5.5]\tablefootmark{b}                                    \\
C$^{18}$O &                                    $J=9\rightarrow 8$ &   303.6 &   237.0 & 11[3.9] & 96[720,25]\tablefootmark{b} -- 10[43,5.4]$^c$ \\
\hline
C$^{17}$O &  $J=8 \rightarrow 7$ &   333.7 &   194.1 & 1.4[1.1] & 6.6[33,2.3]\tablefootmark{b} \\
\hline
CH$^+$ & $J=1 \rightarrow 0$ &   359.0 &    40.1 & 6.7[1.1] & 0.0065[0.0058,0.0088]\tablefootmark{c}\\
\hline
ortho-H$_2$O &              1$_{10} \rightarrow 1_{01}$ &   538.3 &    61.0 & 2.6[1.1] & $\le$30[60,15]\tablefootmark{b,d}  \\
           para-H$_2$O &              2$_{11} \rightarrow 2_{02}$ &   398.6 &   136.9 & 2.0[1.1] &  $\le$45[150,17]\tablefootmark{b,d} 
                                                             \\
\hline
           HCO$^+$ &                                    $J=8 \rightarrow 7$ &   420.3 &   154.1 & $\le$0.7$^{e}$ & $\le$0.35[1.1,0.16]\tablefootmark{b,e}\\
\hline
            H$_2$S &              2$_{12}$ $\rightarrow$ 1$_{01}$ &   407.3 &    55.1 & 1.4[1.1] &    0.031[0.023,0.052]\tablefootmark{c}  \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{Intensities with uncertainty in between brackets.}
\tablefoottext{b}{Beam-averaged column densities using RADEX with $n=10^5$~cm$^{-3}$ and $T = 85$~K, with estimations for 50 and 150~K in between brackets.} 
\tablefoottext{c}{Beam-averaged column densities in the high-density (LTE) limit for 85~K, with estimations for 50 and 150~K in between brackets.} 
\tablefoottext{d}{Note that the density (or temperature) could be higher than assumed, which would decrease the column density, and the para-H$_2$O 2$_{11}\rightarrow2_{02}$ line could be affected by IR pumping.}
\tablefoottext{e}{We used the  HCO$^+$ $J=8 \rightarrow 7$ line because the  HCO$^+$ $J=7 \rightarrow 6$ line is possibly blended with an HCl $J=1 \rightarrow 0$ line.
Column densities from $^{12}$CO and $^{13}$CO lines are uncertain due to high optical depth and are not listed.}}
\end{table}