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Table 1

IR feature used to calculate the column density of each component (frequencies and band strengths for pure ices at 8 K).

Molecule Frequency Band strength
(cm-1) (cm molec-1)

CO2 2344 7.6 × 10-17 a
13CO2 2283 7.8 × 10-17 b
CO 2141 1.1× 10-17c
13CO 2092 1.3 × 10-17 b
CO3 2044 1.5 × 10-17 d
O3 1042 1.4 × 10-17 e

Reference.

(d)

This work.

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