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Table 1
Emission spectroscopy of potentially habitable planets: Science goals (species to be detected and characterized) and requirements in terms of spectral resolution and S/N for two European exoplanet characterization missions.
| Mission | Science requirement | Goal resolution | Goal S/N | References |
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| EChO | H2O, CO2, O3 | 10 | 5 | Tinetti et al. (2012), Tessenyi et al. (2012) |
| Darwin | CO2, O3 | 20 | 5 | Cockell et al. (2009a) |
| Darwin | H2O, CO2, O3 | 20 | 10 | Cockell et al. (2009b) |
| Darwin | CO2 | 5 | 12.5 | Léger et al. (1996) |
| Darwin | O3 | 20 | 20 | Léger et al. (1996) |
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