Hcn

<8 x 10-10 (above 55mbar) Not detected

>8 x 10-9 at peak at 45°S

Ground-based mid-IR

Ground-based mid-IR

Ground-based submillimeter

Ground-based mid-IR

Tokunaga et al. (1981)

Bezard et al. (1995) (prior to SL-9) Davis et al. (1997)

Griffith et al. (2004) (post SL-9)

(continued)

(continued)

Table 4.6 (cont.)

Gas

Mo/e fraction

Measurement technique

Reference

n2

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