Table 3: H2CO, HDCO, and D2CO rotational temperatures and column densities, assuming a 10'' source.
Source H2COa HDCO D2CO
  $T_{\rm rot}$ $N_{\rm tot}$ $T_{\rm rot}$ $N_{\rm tot}$ $N_{\rm tot}^b$ $T_{\rm rot}$ $N_{\rm tot}$
  (K) ($\times$1014 cm-2) (K) ($\times$1013 cm-2) ($\times$1013 cm-2) (K) ($\times$1012 cm-2)

IRAS4A		 20 $\pm$ 2 1.7 $\pm$ 0.4 7.3 $\pm$ 0.3 3.2 $\pm$ 0.6 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 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 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 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 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 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 1.1 $\pm$ 0.16 5.1 $\pm$ 0.3 14.9 $\pm$ 4.2
a Reanalysis of the data from Maret et al. (2004) with the rotational diagram method (cf. text).
b Assuming the same rotational temperature as H2CO.

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