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Fig. 6

image

Escape probability of a 15 μm photon as a function of CO2 optical depth (upper panel) and the CO2 deexcitation rate coefficients as a function of temperature (lower panel). In the upper panel, the numbers show the approximate altitudes in our current Earth model where these points on the line are reached. In the lower panel, the data points are measurements from Siddles et al. (1994) and Castle et al. (2012), and the solid lines are our power-law fits, given in Table 1.

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