\begin{table}%T3
\caption{\label{tableform}H$_2$CO, HDCO, and D$_2$CO~rotational temperatures and column densities, assuming a 10$''$ source.}
\small%\centerline
{
\begin{tabular}{cccccccc}
\hline
\hline
Source   &  \multicolumn{2}{c}{H$_2$CO$^a$}  &  \multicolumn{3}{c}{HDCO} &  \multicolumn{2}{c}{D$_2$CO}  \\
     &  $T_{\rm rot}$ & $N_{\rm tot}$ & $T_{\rm rot}$ &  $N_{\rm tot}$  & $N_{\rm tot}^b$  & $T_{\rm rot}$ & $N_{\rm tot}$  \\
 &    (K) &   ($\times$10$^{14}$~cm$^{-2}$) &   (K) &  ($\times$10$^{13}$~cm$^{-2}$)   &   ($\times$10$^{13}$~cm$^{-2}$)  &  (K) &  ($\times$10$^{12}$~cm$^{-2}$) \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
IRAS4A  & 20~$\pm$~2 & 1.7~$\pm$~0.4   & 7.3~$\pm$~0.3 & 3.2~$\pm$~0.6  & {\it 1.2~$\pm$~0.2}  & 5.0~$\pm$~0.3  & 19~$\pm$~4      \\
IRAS4B  & 38~$\pm$~6 & 1.7~$\pm$~0.5   & 8.2~$\pm$~0.5 & 1.9~$\pm$~0.4  & {\it 1.2~$\pm$~0.3}  & 7.9~$\pm$~0.5  & 7.0~$\pm$~1.5    \\
IRAS2   & 20~$\pm$~2 & 0.84~$\pm$~0.22 & 9.3~$\pm$~0.6& 1.3~$\pm$~0.3    & {\it 0.82~$\pm$~0.13} & 19.6~$\pm$~3.6 & 4.0~$\pm$~1.5   \\
L1448N  & 14~$\pm$~1 & 1.1~$\pm$~0.2 & 7.9~$\pm$~0.5 & 1.0~$\pm$~0.3  & {\it 0.46~$\pm$~0.057} & 4.9~$\pm$~0.8  & 8.2~$\pm$~4.4    \\
L1448mm & 16~$\pm$~1 & 0.42~$\pm$~0.11 & 8.7~$\pm$~0.6 & 1.1~$\pm$~0.3  & {\it 0.57~$\pm$~0.063}  & 5.7~$\pm$~0.3  & 9.1~$\pm$~2.3    \\
L1157mm & 12~$\pm$~1 & 0.20~$\pm$~0.06 & 10.0~$\pm$~0.9 & 0.29~$\pm$~0.09  & {\it 0.24~$\pm$~0.034}& --            & $\le$1.5      \\
L1527   & 12~$\pm$~1 & 0.42~$\pm$~0.17 & 4.8~$\pm$~0.3 & 6.0~$\pm$~1.8 &{\it 1.1~$\pm$~0.16} & 5.1~$\pm$~0.3  & 14.9~$\pm$~4.2       \\ 
\hline
\end{tabular}}
\smallskip
$^a$~Reanalysis of the data from \citet{Maret04} with the rotational diagram method (cf. text).
$^b$~Assuming the same rotational temperature as~H$_2$CO.
\end{table}