\begin{table}%t1
%\centering
\par
\caption{\label{tab:line}Integrated line intensities, $\int
  T_{\rm MB}\ {\rm d}\varv$ (K~km~s$^{-1}$) over the central
  22\farcs5~$\times$~22\farcs5 of each source$^a$ and
  emission-weighted, average line-widths.}
\begin{tabular}{l r r r r r r r r r}
\hline\hline\noalign{\smallskip}
Transition & $\nu$ (GHz)$^b$ & $E_{\rm up}$ (K)$^b$ & SMM1 & SMM3 &
SMM4 & S68N & SMM1-S & \mbox{SMM4-W} & SMM4-S \\
\hline
+0E     & 338.1245 &  78.1 & 0.25 & 0.22 & 0.30 & 0.85 & \ldots & 0.09 & 0.41 \\
--1E     & 338.3446 &  70.5 & 0.58 & 0.45 & 1.09 & 2.90 & 0.52 & 0.90 & 1.38 \\
+0A     & 338.4087 &  65.0 & 0.71 & 0.62 & 1.35 & 3.66 & 1.06 & 1.26 & 2.21 \\
--2A     & 338.5129 & 102.7 & 0.06 & 0.01 &  \ldots & 0.24 & 0.08 & 0.20 & \ldots \\
$\pm$3A$^c$ & 338.5420 & 114.8 & 0.11 & 0.16 & 0.15 & 0.40 & \ldots & \ldots & \ldots \\
+1E     & 338.6150 &  86.1 & 0.16 & 0.08 & 0.18 & 0.45 & \ldots & 0.34 & \ldots \\
+2A     & 338.6399 & 102.7 & 0.09 & 0.07 &  \ldots & 0.26 & \ldots & \ldots & \ldots \\
$\pm$2E$^c$ & 338.7223 &  89.1 & 0.21 & 0.16 & 0.28 & 1.05 & \ldots & 0.13 & 0.11 \\
%\hline
$\Delta\varv$ (km~s$^{-1}$) & & & $3.4 \pm 0.9$ & $4.4 \pm 2.5$ & $4.0 \pm 0.7$ & $7.2 \pm 1.3$ & $4.3 \pm 0.9$ & $4.0 \pm 0.3$ & $4.1 \pm 0.3$ \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{Non-detections are marked by ``\ldots'', for which an   upper limit of 0.03~K~km~s$^{-1}$ applies.}
\tablefoottext{b}{Frequencies and upper level energies are from the
  Cologne Database for Molecular Spectroscopy \citep[CDMS;][]{muller01}.}
\tablefoottext{c}{Lines are blended. The frequencies and upper level energies are average values.}}
\end{table}