Table 5: Deuterium fractionation for formaldehyde and methanol, for an assumed source size of 10''. Error bars are associated with a 90% confidence interval (see appendix).

Source		  HDCOa D2CO D2CO CH2DOH CH3OD CHD2OH CHD2OH
  H2CO  H2CO  HDCO  CH3OH CH3OH CH3OH CH2DOH

IRAS4A		 $\rm0.20_{-0.09}^{+0.13}$ $\rm0.12_{-0.05}^{+0.08}$ $\rm0.62_{-0.26}^{+0.33}$ $\rm0.65_{-0.21}^{+0.30}$ $\rm0.047_{-0.021}^{+0.029}$ $\rm0.17_{-0.06}^{+0.09}$ $\rm0.26_{-0.07}^{+0.08}$

IRAS4B		 $\rm0.13_{-0.06}^{+0.10}$ $\rm0.046_{-0.024}^{+0.038}$ $\rm0.39_{-0.17}^{+0.23}$ $\rm0.43_{-0.20}^{+0.38}$ $\rm0.016_{-0.008}^{+0.016}$ $\rm0.13_{-0.07}^{+0.12}$ $\rm0.31_{-0.06}^{+0.07}$

IRAS2		 $\rm0.17_{-0.08}^{+0.12}$ $\rm0.052_{-0.034}^{+0.048}$ $\rm0.33_{-0.21}^{+0.28}$ $\rm0.62_{-0.33}^{+0.71}$ $\le$0.08 $\rm0.25_{-0.14}^{+0.29}$ $\rm0.41_{-0.15}^{+0.19}$

L1448N		 $\rm0.094_{-0.050}^{+0.062}$ $\rm0.077_{-0.069}^{+0.079}$ $\rm0.93_{-0.83}^{+1.14}$ $\le$1.8 $\le$0.67 $\le$8.3 -

L1448mm		 $\rm0.29_{-0.15}^{+0.23}$ $\rm0.24_{-0.12}^{+0.18}$ $\rm0.91_{-0.48}^{+0.73}$ $\le$7.1 $\le$2.5 $\le$3.9 -

L1157mm		 $\rm0.16_{-0.10}^{+0.15}$ $\le$0.08 $\le$0.52 $\le$5.4 $\le$1.2 $\le$5.1 -

L1527		 $\rm 1.7_{-1.1}^{+2.6}$ $\rm0.44_{-0.29}^{+0.60}$ $\rm0.28_{-0.16}^{+0.25}$ - - - -

IRAS 16293		 0.15 $\pm$ 0.07 0.05 $\pm$ 0.025 0.3 $\pm$ 0.2 b $\rm0.37_{-0.19}^{+0.38}$ b $\rm0.018_{-0.012}^{+0.022}$ b $\rm0.074_{-0.044}^{+0.084}$ b $\rm0.21_{-0.10}^{+0.11}$
a HDCO/H2CO ratios obtained when assuming the same rotational temperature for HDCO as for H2CO are resp. $\rm0.075_{-0.031}^{+0.047}$, $\rm0.080_{-0.044}^{+0.068}$, $\rm0.11_{-0.04}^{+0.07}$, $\rm0.043_{-0.015}^{+0.021}$, $\rm0.15_{-0.06}^{+0.10}$, $\rm0.14_{-0.06}^{+0.11}$, $\rm0.33_{-0.18}^{+0.42}$ for the 7 sources.
HDCO/H2CO ratios obtained assuming a 15'' source are resp. $\rm0.14_{-0.07}^{+0.11}$, $\rm0.07_{-0.05}^{+0.09}$, $\rm0.14_{-0.07}^{+0.11}$, $\rm0.08_{-0.04}^{+0.06}$, $\rm0.23_{-0.14}^{+0.19}$, $\rm0.19_{-0.12}^{+0.22}$, $\rm0.89_{-0.63}^{+1.43}$. They are thus consistent with the ratios derived for a 10'' source, within the error bars.
b Error bars recomputed from Parise et al. (2004) for a 90% confidence interval (see appendix).

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