Table 3: R₂₁ line ratio for spiral arms of M 81 by Brouillet et al. (1991).
Field Offsets $\int T_{\rm mb}$ (1-0)dv $\int T_{\rm mb}$ (2-1)dv R₂₁

( $^{\prime \prime }$ , $^{\prime \prime }$ ) [K km s^-1] [K km s^-1]

N1 (0,0) 1.14 2.11 1.85

N5 (0,0) 1.52 0.70 0.46

(10,0) 1.27 1.05 0.83

(-10,0) 1.39 0.70 0.50

(20,0) 0.89 0.53 0.59

(-20,0) 1.52 1.05 0.69

(20,-10) 2.03 1.05 0.52

N7 (0,0) 2.53 1.23 0.49

(20,0) 1.52 1.93 1.27

(-20,0) 2.28 1.05 0.46

(0,20) 0.51 1.40 2.77

(0,-20) 1.39 4.04 2.90

S2 (-10,0) 0.76 1.05 1.39

(0,-10) 2.03 2.28 1.13

(20,0) 2.03 1.40 0.69

(-20,0) 1.65 1.40 0.85

**Table 3:** R₂₁ line ratio for spiral arms of M 81 by Brouillet et al. (1991).
Field	Offsets	$\int T_{\rm mb}$ (1-0)dv	$\int T_{\rm mb}$ (2-1)dv	R₂₁
	( $^{\prime \prime }$ , $^{\prime \prime }$ )	[K km s^-1]	[K km s^-1]
N1	(0,0)	1.14	2.11	1.85
N5	(0,0)	1.52	0.70	0.46
	(10,0)	1.27	1.05	0.83
	(-10,0)	1.39	0.70	0.50
	(20,0)	0.89	0.53	0.59
	(-20,0)	1.52	1.05	0.69
	(20,-10)	2.03	1.05	0.52
N7	(0,0)	2.53	1.23	0.49
	(20,0)	1.52	1.93	1.27
	(-20,0)	2.28	1.05	0.46
	(0,20)	0.51	1.40	2.77
	(0,-20)	1.39	4.04	2.90
S2	(-10,0)	0.76	1.05	1.39
	(0,-10)	2.03	2.28	1.13
	(20,0)	2.03	1.40	0.69
	(-20,0)	1.65	1.40	0.85

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