\begin{table}%T9
   %\centering
\par
      \caption{Preferred chemical scenarios for the different sources$^{{a}}$.
                }
         \label{chemscenoverview}
      $$ 
         \begin{array}{p{0.45\linewidth}p{0.47\linewidth}p{0.47\linewidth}p{0.48\linewidth}p{0.39\linewidth}p{0.33\linewidth}}
            \hline
            \hline
            \noalign{\smallskip}
Source & Ice evaporation & Freeze-out & Cold gas-phase H$_2$O & $N$(H$_2$O$_{{\rm ice}}$)$^{b}$ & $T_{{\rm ex}}$(C$_2$H$_2$)$^{c}$ (K)\\ 
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
AFGL~2591 & YES, $T\sim90$--110~K & YES, $T\ltsim90$--110~K & $x$(H$_2$O)$~\sim~$0--10$^{-8}$ & 1.7(18) & 900 \\
NGC~7538~IRS1 & YES & YES, $T\ltsim90$--110~K & $x$(H$_2$O)$~\ltsim~$10$^{-8}$ & 3.1(18) & 500 \\
W~3~IRS5 & YES, $T\sim90$--110~K & YES, $T\ltsim90$--110~K & $x$(H$_2$O)$~\ltsim~$10$^{-8}$ & 5.1(18) & 500 \\ 
S~140~IRS1 & ? & YES, $T\ltsim100$~K & $x$(H$_2$O)$~\sim~$0 & 2.0(18) & 390 \\ 
MonR2~IRS3 & YES, $T\sim90$--110~K & ? & ? & 1.9(18) & 310 \\
NGC~7538~IRS9 & NO & YES, $T\ltsim100$~K & $x$(H$_2$O)$~\sim~$0 & 7.0(18) & 300 \\
            \noalign{\smallskip}
            \hline
         \end{array}
     $$
\end{table}