**Table 1:** 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.
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)
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)
IRAS 16293	16:32:22.6	-24:28:33.0	$\rho$ -Ophiucus	160	27	5.4	2	43	+4

^a From André et al. (2000) and Cernis (1990).
^b From Jørgensen et al. (2002).

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