Table 3: Integrated fluxes of H₂¹³CO lines in $T_{\rm mb} ~ {\rm d}V$ units. Upper limits are given as 2 $\sigma$ . The "-'' symbol indicates lack of the relevant observation.
o-H₂¹³CO p-H₂¹³CO

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

E_u (K) 21.7 44.8 61.3 98.5

A_u,l (s^-1) 1.5 $\times$ 10^-4 1.7 $\times$ 10^-3 3.4 $\times$ 10^-3 1.1 $\times$ 10^-3

$\nu$ (GHz) 137.450 274.762 343.325 354.899

HPBW ('') 17 9 14 14

Telescope IRAM IRAM JCMT JCMT

$\eta_{\rm mb}$ or $B_{\rm eff}$ / $F_{\rm eff}$ 0.74 0.47 0.63 0.63

NGC 1333-IRAS 4A 0.4 $\pm$ 0.1 0.3 $\pm$ 0.1 0.3 $\pm$ 0.2 <0.1

NGC 1333-IRAS 4B - - 0.3 $\pm$ 0.1 <0.1

NGC 1333-IRAS 2 0.2 $\pm$ 0.1 - 0.4 $\pm$ 0.2 <0.1

L1448-MM - - <0.1 <0.2

L1448-N 0.2 $\pm$ 0.1 <0.1 - -

L1157-MM - - <0.1 <0.1

**Table 3:** Integrated fluxes of H₂¹³CO lines in $T_{\rm mb} ~ {\rm d}V$ units. Upper limits are given as 2 $\sigma$ . The "-'' symbol indicates lack of the relevant observation.
	o-H₂¹³CO		p-H₂¹³CO
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
E_u (K)	21.7	44.8	61.3	98.5
A_u,l (s^-1)	1.5 $\times$ 10^-4	1.7 $\times$ 10^-3	3.4 $\times$ 10^-3	1.1 $\times$ 10^-3
$\nu$ (GHz)	137.450	274.762	343.325	354.899
HPBW ('')	17	9	14	14
Telescope	IRAM	IRAM	JCMT	JCMT
$\eta_{\rm mb}$ or $B_{\rm eff}$ / $F_{\rm eff}$	0.74	0.47	0.63	0.63
NGC 1333-IRAS 4A	0.4 $\pm$ 0.1	0.3 $\pm$ 0.1	0.3 $\pm$ 0.2	<0.1
NGC 1333-IRAS 4B	-	-	0.3 $\pm$ 0.1	<0.1
NGC 1333-IRAS 2	0.2 $\pm$ 0.1	-	0.4 $\pm$ 0.2	<0.1
L1448-MM	-	-	<0.1	<0.2
L1448-N	0.2 $\pm$ 0.1	<0.1	-	-
L1157-MM	-	-	<0.1	<0.1

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