Ch

3.5 x 10-6 (~10mbar) ~3 x 10-7 (200mbar) increasing by factor of ~2 towards poles ~4 x 10-6 (5mbar) increasing by factor of ~2 towards poles

Mid-IR Cassini mid-IR

Cassini mid-IR

Nixon et a/. (2007)

C2H2

3.5 x 10-8 (~10mbar) ~3 x 10-9 (200 mbar) and roughly constant with latitude ~4 x 10-8 (5 mbar) at 20°N, decreasing to x 10-8 at poles

Mid-IR Cassini mid-IR

Cassini mid-IR

Nixon et a/. (2007)

C4H2

~10-12 (~10 mbar) Detected

Modeled Cassini mid-IR

Moses et a/. (2004) Kunde et a/. (2004)

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