Table 2: Collisional line width (at 300 K) and temperature dependence factor n for NH₃, PH₃ and CO with H₂ and He and for Saturn and Uranus (a blank space means that no data is available).

	H2	He	Saturn	Uranus
NH3	0.069		0.069	0.069
PH3 (1-0)	0.1078	0.0618	0.1011	0.1003
PH3 (2-1)	0.1064	0.0606	0.0997	0.0990
CO (1-0)	0.0749	0.0479	0.0709	0.0696
CO (2-1)	0.0715	0.0468	0.0679	0.0666
n	H2	He	Saturn	Uranus
NH3	0.67		0.67	0.67
PH3	0.73	0.30	0.67	0.66
CO (1-0) & (2-1)			0.60	0.60

References: Berge & Gulkis (1976) and Brown & Peterson (1994) for NH3, Lévy et al. (1993) and Lévy et al. (1994) for PH3 and Draegert & Dudley (1968), Varanasi (1988), Beaky et al. (1996) and Weisstein & Serabyn (1996) for CO.