Co

<4 x 10~8 (stratosphere) <10~8 (troposphere)

<1.7 x 10-8 (at 3.1 bar cloud tops) increasing to ~2.5 x 10 ~8 at tropopause

Ground-based mm Ground-based 2.6 mm

Ground-based 1-1.5 mm HST 5 ^m

Rosenqvist et al. (1992) Marten et al. (1993)

Encrenaz et al. (1996)

Encrenaz et al. (2004)

hcn

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