**Table 2:** Isotopic ratios of sulfur^a.
Ratio	solar	ISM	C.R.	IRC+10216
	system
³²S/³⁴S	22.64(0.00)	24.4(5)^b	16(-5, +11)	21.8(2.6)
³²S/³³S	126.95(0.05)	$\sim$ 150	38(-18, +500)	121(15)
³²S/³⁶S	6519(20)	3280(760)		2700(600)
³⁴S/³³S	5.606(0.002)	6.3(1)		5.6(.3)
³⁴S/³⁶S	288(1)	115(17)		107(15)

^a References: solar system data: Canyon Diablo troilite (CDT), Ding et al. (2001); ISM data: Chin et al. (1996), Mauersberger et al. (1996), most ISM data are from the inner Galaxy; Cosmic Rays: these are "source abundances'', Thayer (1997); IRC+10216: Kahane et al. (2000), this paper.
^b The average value for sources at various galactocentric radii; the data by Chin et al. (1996) indicate a possible galactocentric ³²S/³⁴S abundance gradient, which would correspond to a value of 32( $\pm5$ ) at the solar circle.

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