\begin{table}%t2
\par
%\centering
\par
\caption{\label{observations}Observations.}
\small \begin{tabular}{lllll}
\hline\hline 
Name & $\lambda$ (mm) & Beam size & Date & Telescope \\
\hline 
MWC~297 & 1.3 & $1.1'' \times 0.4''$ & Feb. 2006 & PdBI \\
        & 2.6 & $1.4'' \times 0.9''$ & Feb. 2006 & \\
LKH$\alpha$~215 & 1.3 & $3.3'' \times  1.8''$ & Apr. 2002 & PdBI \\
                & 2.6 & $6.8'' \times  3.7''$ & Apr. 2002 & \\
Z~CMa           & 1.3 & $2.3'' \times 0.9''$ & Jan./Mar. 2006 & PdBI \\
                & 2.6 & $4.1''\times 2.0''$ & Jan./Mar. 2006 &  \\
MWC 297 &  7  & $1.9'' \times  1.6 ''$ & Dec. 2005 & VLA\\
        &  13 & $3.9'' \times  3.1 ''$ & Dec. 2005 & \\
Z CMa   &  7  & $1.4'' \times  1.4 ''$ & Oct./Dec. 2005 & VLA \\
        &  13 & $3.5'' \times  2.7 ''$ & Oct./Dec. 2005 & \\
        &  36 & $9.2'' \times  6.6 ''$ & Oct./Dec. 2005 &  \\
 \hline 
\end{tabular}
\end{table}