Ch

3 x 10~6 at O.lmbar <2 x 10~8 in stratosphere ~4 x 10-7 in stratosphere (1.0 ± 0.1) x 10~8 at O.lmbar

Modeled

Ground-based 12 ^m Ground-based 12 ^m Spitzer 10-20 ^m

Encrenaz et al. (1998) Orton et al. (1987) Hammel et al. (2006) Burgdorf et al. (2006)

4 x 10-7 at 0.1 mbar

Voyager UV ISO/SWS

Yelle et al. (1989) Encrenaz et al. (1998)

C4H2

(1.6 ± 0.2) x 10-10 at 0.1 mbar

Spitzer 10-20 ^m

Burgdorf et al. (2006)

C2H4

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