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. 2009 Jun 1;106(24):9576–9579. doi: 10.1073/pnas.0809436106

Fig. 2.

Fig. 2.

Absorption spectra at the top of the atmosphere in the present-day Earth for β = 1 (blue) and 0.2 atm (orange), showing the effect of pressure broadening. The spectral resolution is 20 cm−1. The major species responsible for absorption are labeled. (Inset) The total radiative forcing due to the absorption by greenhouse gases as a function of β.