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. 2014 Aug 22;5:4705. doi: 10.1038/ncomms5705

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Superabsorption of the effective two-level system indicated in Fig. 2. The green shading indicates the superabsorption region, the red when the extraction rate is below what could be extracted from uncorrelated atoms; both are for a system of 20 atoms and mode occupancy n(ω_good)=10. The maximum extraction possible from independent atoms (Γ_ind=n(ω_good)N_γ) is used for comparison.