\begin{table}%t1
\caption{\label{sources}Parameters of the sources targeted in our deuterated formaldehyde and methanol observations. IRAS 16293$-$2422 is added for comparison. The offsets used for the OFF position of the position switching mode are indicated in the last column.}
\small%\centerline
{
\begin{tabular}{ccccccccccc}
\hline
\hline\noalign{\smallskip}
Source & $\alpha$ (2000) & $\delta$ (2000) & Region & Distance & $L_{\rm bol}$$^a$ & $M_{\rm env}$$^b$ & $L_{\rm smm}$/$L_{\rm bol}$$^a$ & $T_{\rm bol}$ & $V_{\rm LSR}$ & offsets\\
 & & & &   (parsec) &   ($L_{\odot}$)  &   ($M_{\odot}$)  &   (\%) &   (K) &   (km~s$^{-1}$) &   (arcsec) \\
\hline
IRAS4A & 03:29:10.3 & 31:13:32 & Perseus & 220 & 6 & 2.3 & 5 & 34 & +7 & (--150, 240)\\
IRAS4B & 03:29:12.0 & 31:13:09 & Perseus & 220 & 6 & 2.0 & 3 & 36 & +7 & (--180, 260)\\
IRAS2  & 03:28:55.4 & 31:14:35 & Perseus & 220 & 16 & 1.7 & $\leq$ 1 & 50 & +7 & (70, 180)  \\
L1448N   & 03:25:36.3 & 30:45:15 & Perseus & 220 & 6 & 3.5 & 3 & 55 & +5 & (300, 300)\\
L1448mm  & 03:25:38.8 & 30:44:05 & Perseus & 220 & 5 & 0.9 & 2 & 60 & +5 & (300, 300) \\
L1157mm  & 20:39:06.2 & 68:02:22 & Isolated & 325 & 11 & 1.6 & 5 & 60 & +5 & (150, 0) \\
L1527    & 04:39:53.9 & 26:03:10 & Taurus & 140 & 2 & 0.9 & 0.7 & 60 & +5 & (240, 0) \\
\hline
IRAS~16293 & 16:32:22.6 & --24:28:33.0 & $\rho$-Ophiucus & 160 & 27 & 5.4 & 2 & 43 & +4 & \\
\hline
\end{tabular}}
\smallskip
$^a$ From \citet{Andre00} and \citet{Cernis90}.\\
$^b$ From \citet{Jorgensen02}.
\end{table}