Table 4: H₂CO lines opacities derived from the H₂¹³CO observations.
o-H₂CO p-H₂CO

Transition 2_1,2-1_1,1 4_1,4-3_1,3 5_1,5-4_1,4 5_2,4-4_2,3

NGC 1333-IRAS 4A $\rm 1.0^{+0.7}_{-0.4}$ $\rm0.5^{+1.2}_{-0.4}$ $\rm 1.2^{+9.9}_{-0.7}$ <2

NGC 1333-IRAS 4B - - $\rm0.9^{+1.3}_{-0.5}$ <0.5

NGC 1333-IRAS 2 $\rm 1.1^{+1.9}_{-0.6}$ - $\rm 5.5^{+11.1}_{-2.2}$ <4

L1448-MM - - <2 -

L1448-N $\rm0.4^{+1.1}_{-0.3}$ <0.1 - -

L1157-MM - - <1.4 -

**Table 4:** H₂CO lines opacities derived from the H₂¹³CO observations.
	o-H₂CO		p-H₂CO
Transition	2_1,2-1_1,1	4_1,4-3_1,3	5_1,5-4_1,4	5_2,4-4_2,3
NGC 1333-IRAS 4A	$\rm 1.0^{+0.7}_{-0.4}$	$\rm0.5^{+1.2}_{-0.4}$	$\rm 1.2^{+9.9}_{-0.7}$	<2
NGC 1333-IRAS 4B	-	-	$\rm0.9^{+1.3}_{-0.5}$	<0.5
NGC 1333-IRAS 2	$\rm 1.1^{+1.9}_{-0.6}$	-	$\rm 5.5^{+11.1}_{-2.2}$	<4
L1448-MM	-	-	<2	-
L1448-N	$\rm0.4^{+1.1}_{-0.3}$	<0.1	-	-
L1157-MM	-	-	<1.4	-

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