\begin{table}%t3
\caption{\label{results}Summary of observational results}
%\centerline
 {\small \begin{tabular}{llllllll}
\hline\hline\noalign{\smallskip}
Name & 3.6~cm & 1.3~cm & 7~mm & 2.7~mm & 1.3~mm & Spec. index$^1$ & $F_{\rm PdBI}$/$F^2_{\rm JCMT}$ \\
 & (mJy/beam) & (mJy/beam) & (mJy/beam) & (mJy/beam) & (mJy/beam) & (1.3--2.6~mm) & (1.3~mm) \\
\hline 
MWC 137 &  & 0.9 & 1.3 & 4.1 & 7.1 & 0.79/-- & 0.075 \\
R Mon &  & 0.9 & 1.3 & 4.1 & 11.8 & 1.53/2.14 & 0.15 \\
MWC 1080 &  &  &  & $<$1.7 & 3.1 & $>$0.87/$>$1.02 & 0.013 \\
MWC 297 & & 23 & 29 & 149 & 175 & 1.01$^3$/1.31$^3$ & 0.39 \\  
LkH$\alpha$~215 &  &  &  & $<$0.6 & $<$1.5 & --/-- & $<$0.026 \\
Z CMa & 2.2 & 2.1 & 2.1 & 8.5 & 26 & 1.61/1.88 & 0.037 \\
 \hline
\end{tabular}}
\medskip
$^1$ The 1.3~mm--2.7~mm spectral index before ({\it left}) and after ({\it right}) subtracting the
free-free emission; $^2$~see references in Appendix~A; $^3$~beam dependent, see Sect.~\ref{discuss297}.
\end{table}