Table 3.

LVG estimation for column densities and abundances. We adopted a molecular hydrogen density of n(H₂)= 1×10⁶ cm⁻³ and T_k= 30 K. Fractional abundances are calculated assuming X(C¹⁸O)=1.7×10⁻⁷. The velocity dispersion is assumed to be 1.5 km s⁻¹. Notation: 1(15) means 1×10¹⁵.

Positions	NC18O cm−2	Np−H2CO cm−2	NSO cm−2	$\frac{N_{\text{SO}}}{N_{{\text{H}}_{\text{2}}}}$	$\frac{N_{\text{p}-{\text{H}}_2\text{CO}}}{N_{{\text{H}}_2}}\times 4$	$\frac{N_{SO}}{N_{p-H_{2}CO}}\times 0.25$
A	9.5(15)	4.0(12)	1.0(13)	1.7(-10)	2.9(-10)	0.6
B	1.0(16)	4.0(12)	7.0(12)	1.1(-10)	2.7(-10)	0.4
C	7.0(15)	5.5(12)	6.0(12)	1.4(-10)	5.4(-10)	0.3
D	1.1(16)	4.0(12)	1.0(13)	1.5(-10)	2.5(-10)	0.6
E	7.5(15)	5.0(12)	< 6.0(12)	< 1.4(-10)	4.5(-10)	< 0.3
F	1.1(16)	4.5(12)	1.0(13)	1.5(-10)	2.8(-10)	0.5
G	1.1(16)	7.0(12)	< 9.0(12)	< 1.4(-10)	4.3(-10)	< 0.3
H	1.2(16)	4.7(12)	< 5.0(12)	< 7.1(-11)	2.7(-10)	< 0.3
J	8.0(15)	4.4(12)	1.0(13)	2.1(-10)	3.7(-10)	0.6
K	2.2(15)	< 4.0(12)	< 5.0(12)	< 3.9(-10)	< 1.2(-09)	-