Table 1: List of measurements of CH₄ abundances in Saturn's atmosphere published since 1981.
CH₄/H₂ ( $\times$ 10^-3) Solar enrichment Reference Measurement

2 $\pm$ 0.5 3.4 $\pm$ 0.9 Kerola et al. (1997) KAO

2^+1.0_-0.8 3.4^+1.7_-1.4 Encrenaz & Combes (1982) ground-based

2.2^+0.8_-0.2 3.8^+1.4_-0.3 Killen (1988) ground-based

2.5 4.3 Tomasko & Doose (1984) Pioneer IPP

3 $\pm$ 0.6 5.2 $\pm$ 1.0 Karkoschka & Tomasko (1992) ground-based

4 $\pm$ 2 6.9 $\pm$ 3.4 Buriez & de Bergh (1981) ground-based

4.2 $\pm$ 0.4 7.2 $\pm$ 0.7 Trafton (1985) ground-based

4.4 $\pm$ 1.2 7.6 $\pm$ 2.1 Lellouch et al. (2001) ISO-SWS

4.5^+2.4_-1.9 7.7^+4.1_-3.3 Courtin et al. (1984) Voyager IRIS

5.1 $\pm$ 1.0 8.8 $\pm$ 1.7 Flasar et al. (2005) Cassini CIRS

**Table 1:** List of measurements of CH₄ abundances in Saturn's atmosphere published since 1981.
CH₄/H₂ ( $\times$ 10^-3)	Solar enrichment	Reference	Measurement
2 $\pm$ 0.5	3.4 $\pm$ 0.9	Kerola et al. (1997)	KAO
2^+1.0_-0.8	3.4^+1.7_-1.4	Encrenaz & Combes (1982)	ground-based
2.2^+0.8_-0.2	3.8^+1.4_-0.3	Killen (1988)	ground-based
2.5	4.3	Tomasko & Doose (1984)	Pioneer IPP
3 $\pm$ 0.6	5.2 $\pm$ 1.0	Karkoschka & Tomasko (1992)	ground-based
4 $\pm$ 2	6.9 $\pm$ 3.4	Buriez & de Bergh (1981)	ground-based
4.2 $\pm$ 0.4	7.2 $\pm$ 0.7	Trafton (1985)	ground-based
4.4 $\pm$ 1.2	7.6 $\pm$ 2.1	Lellouch et al. (2001)	ISO-SWS
4.5^+2.4_-1.9	7.7^+4.1_-3.3	Courtin et al. (1984)	Voyager IRIS
5.1 $\pm$ 1.0	8.8 $\pm$ 1.7	Flasar et al. (2005)	Cassini CIRS

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