Table 2: CN Zeeman sources - positions and physical parameters.
Cloud $\alpha(2000)$ $\delta(2000)$ $T^*_{\rm A}$ v $\Delta v$ d r $n({\rm H_2})$ $N_{n,r}({\rm H_2})$ $N_{{\rm CN}}({\rm H_2})$ $M_{\rm obs}$ $M_{\rm vir}$

K km s^-1 km s^-1 kpc pc 10⁵ cm^-3 10²³ cm^-2 10²³ cm^-2 $M_\odot$ $M_\odot$

W3OH 02 27 04.1 61 52 22 2.2 -46.5 4.2 2.4 0.12 1.5 1.1 0.9 88 430

OMC1s 05 35 13.5 -05 22 52 14.7 8.5 2.0 0.45 0.03 18 3.4 2.3 17 26

OMC1n1 05 35 14.5 -05 22 07 13.0 9.9 1.4 0.45 0.03 18 3.6 1.5 16 13

OMC1n4 05 35 16.8 -05 19 31 14.5 9.4 1.5 0.45 0.03 14 2.8 2.2 18 15

NGC2024 05 41 44.2 -01 55 41 8.6 11.0 2.2 0.45 0.04 5.9 1.4 2.2 18 40

S255 06 12 53.7 17 59 22 5.6 7.3 2.3 2.5 0.18 3.7 4.2 1.3 500 200

G10.6 18 10 28.7 -19 55 49 8.9 2.8 5.8 6.5 0.19 14 16.4 4.9 2100 1300

M17SWHI 18 20 22.9 -16 11 32 17.3 19.9 4.3 1.3 0.11 6.0 4.2 6.2 430 440

M17SWCN 18 20 25.0 -16 13 42 16.9 19.6 3.3 1.3 0.10 6.0 3.7 5.3 290 230

S106OH 20 27 28.4 37 22 41 5.3 -1.7 2.0 1.7 0.07 1.0 0.4 0.9 17 55

S106CN 20 27 29.5 37 22 54 7.3 -1.8 1.9 1.7 0.07 1.0 0.4 1.3 21 50

DR21OH1 20 38 59.9 42 22 38 4.5 -4.7 2.3 3 0.15 1.7 1.5 1.0 170 160

DR21OH2 20 38 59.9 42 22 38 2.6 -0.9 2.3 3 0.15 1.7 1.5 0.7 140 160

S140 22 19 17.1 63 18 35 6.0 -6.3 2.4 0.9 0.05 6.0 1.0 1.3 28 63

**Table 2:** CN Zeeman sources - positions and physical parameters.
Cloud	$\alpha(2000)$	$\delta(2000)$	$T^*_{\rm A}$	v	$\Delta v$	d	r	$n({\rm H_2})$	$N_{n,r}({\rm H_2})$	$N_{{\rm CN}}({\rm H_2})$	$M_{\rm obs}$	$M_{\rm vir}$
			K	km s^-1	km s^-1	kpc	pc	10⁵ cm^-3	10²³ cm^-2	10²³ cm^-2	$M_\odot$	$M_\odot$
W3OH	02 27 04.1	61 52 22	2.2	-46.5	4.2	2.4	0.12	1.5	1.1	0.9	88	430
OMC1s	05 35 13.5	-05 22 52	14.7	8.5	2.0	0.45	0.03	18	3.4	2.3	17	26
OMC1n1	05 35 14.5	-05 22 07	13.0	9.9	1.4	0.45	0.03	18	3.6	1.5	16	13
OMC1n4	05 35 16.8	-05 19 31	14.5	9.4	1.5	0.45	0.03	14	2.8	2.2	18	15
NGC2024	05 41 44.2	-01 55 41	8.6	11.0	2.2	0.45	0.04	5.9	1.4	2.2	18	40
S255	06 12 53.7	17 59 22	5.6	7.3	2.3	2.5	0.18	3.7	4.2	1.3	500	200
G10.6	18 10 28.7	-19 55 49	8.9	2.8	5.8	6.5	0.19	14	16.4	4.9	2100	1300
M17SWHI	18 20 22.9	-16 11 32	17.3	19.9	4.3	1.3	0.11	6.0	4.2	6.2	430	440
M17SWCN	18 20 25.0	-16 13 42	16.9	19.6	3.3	1.3	0.10	6.0	3.7	5.3	290	230
S106OH	20 27 28.4	37 22 41	5.3	-1.7	2.0	1.7	0.07	1.0	0.4	0.9	17	55
S106CN	20 27 29.5	37 22 54	7.3	-1.8	1.9	1.7	0.07	1.0	0.4	1.3	21	50
DR21OH1	20 38 59.9	42 22 38	4.5	-4.7	2.3	3	0.15	1.7	1.5	1.0	170	160
DR21OH2	20 38 59.9	42 22 38	2.6	-0.9	2.3	3	0.15	1.7	1.5	0.7	140	160
S140	22 19 17.1	63 18 35	6.0	-6.3	2.4	0.9	0.05	6.0	1.0	1.3	28	63

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