**Table 2:** Overview of the [C I], CO, and ¹³CO data of M 83 and M 51. $\theta _{\rm b}$ is the telescope half power beamwidth. All spectra are scaled to main beam brightness temperatures, $T_{\rm mb}=T_{\rm A}^*/\eta _{\rm {mb}}$ .
	Line	$\theta _{\rm b}$	Telescope	$\eta_{\rm {mb}}$	Refs.
		('')
M 83 at (0, 0), (89, 38), (-80, -72)
	[C I] 1-0	10	JCMT 15 m	0.52	1	point.
	CO 1-0	21	IRAM 30 m	0.78	1	point.
	CO 1-0	55	NRAO 12 m	0.88	2	map
	CO 2-1	10	IRAM 30 m	0.57	1	point.
	CO 2-1	28	NRAO 12 m	0.56	2	map
	CO 3-2	25	CSO 10 m	0.75	3	map
	¹³CO 1-0	22	IRAM 30 m	0.79	1	point.
	¹³CO 2-1	10	IRAM 30 m	0.60	1	point.
M 51 at (0, 0), (72, 84), (-84,-84)
	[C I] 1-0	10	JCMT 15 m	0.52	1	point
	CO 1-0	21	IRAM 30 m	0.65	5	map
	CO 2-1	10	IRAM 30 m	0.46	5	map
	CO 3-2	22	HHT 10 m	0.50	4	map
	¹³CO 1-0	22	IRAM 30 m	0.79	1	point.
	¹³CO 2-1	10	IRAM 30 m	0.60	1	point.

References: 1: new data for this paper; 2: Crosthwaite et al. (2002); 3: Bayet et al. (priv. comm.); 4: Wielebinski et al. (1999), Nieten et al. (1999), Dumke et al. (2001); 5: Garcia-Burillo et al. (1993b). The last column indicates whether single pointings or maps are available. The mapped CO data was Gauss-smoothed to the 80'' ISO/LWS resolution.

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