\begin{table}%t5
\caption{\label{online2}Summary of p-H$_2$$^{18}$O~$2_{02}$--1$_{11}$ model results, which are compared with $\int T_{\rm MB}~{\rm d}\varv \le  0.010$~K~km$^{-1}$.}
\scriptsize
%\centering
\par
\begin{tabular}{cccc}
\hline \hline\noalign{\smallskip}
\multicolumn{2}{c} {Envelope abundance} & $T_{\rm MB}^{\rm peak}$ & $\int T_{\rm MB}~{\rm d}\varv$ \\
Inner & Outer & (K) & (K km s$^{-1}$) \\
\hline\noalign{\smallskip}
$3 \times 10^{-6}$ &       $1 \times 10^{-10}$ &      0.0088 &    0.033    \\
$1 \times 10^{-6}$ &       $1 \times 10^{-10}$ &      0.0088 &    0.033    \\
$3 \times 10^{-7}$ &       $1 \times 10^{-10 }$ &     0.0085 &    0.032    \\
    \noalign{\smallskip}
$3 \times 10^{-6}$ &       $ 3 \times 10^{-11}$ &     0.0026 &   0.0097    \\
$1 \times 10^{-6}$ &       $ 3 \times 10^{-11}$ &     0.0027 &   0.0099    \\
$3 \times 10^{-7}$ &       $ 3 \times 10^{-11}$ &     0.0023 &   0.0085    \\
    \noalign{\smallskip}
$3 \times 10^{-6}$ &        $1 \times 10^{-11}$ &     0.0008 &   0.0032    \\
$1 \times 10^{-6}$ &        $1 \times 10^{-11}$ &     0.0008 &   0.0031    \\
$3 \times 10^{-7}$ &        $1 \times 10^{-11 }$ &    0.0008 &   0.0030    \\
\hline
\end{tabular} 
\vspace*{8cm}
\end{table}