\begin{table}%T8
   %\centering
\par
      \caption{Observed LWS line fluxes for NGC~7538~IRS1.}
         \label{fluxirs1}
      $$ 
         \begin{array}{lcl}
            \hline
            \hline
            \noalign{\smallskip}
{\rm Wavelength} & {\rm H_2O~~ transition} & {\rm ~ ~ ~ ~ ~ ~ ~ Flux}^a \\
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
~ ~ ~ 99.5~\mu{\rm m} & 5_{05}{-}4_{14} & {<}1.7(-17) \\ 
108.1~\mu{\rm m} & 2_{21}{-}1_{10} & {<}9.6(-18) \\
113.5~\mu{\rm m} & 4_{14}{-}3_{03} & {<}1.2(-17) \\
132.4~\mu{\rm m} & 4_{23}{-}4_{14} & {<}9.7(-18)^{{b}} \\
138.5~\mu{\rm m} & 3_{13}{-}2_{02} & {<}1.6(-17) \\
174.6~\mu{\rm m} & 3_{03}{-}2_{12} & {<}1.0(-17) \\
179.5~\mu{\rm m} & 2_{12}{-}1_{01} & {<}1.9(-17) \\
180.5~\mu{\rm m} & 2_{21}{-}2_{12} & {<}1.4(-17) \\
            \noalign{\smallskip}
            \hline
         \end{array}
     $$
   \end{table}