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. 2016 Dec 14;7:13686. doi: 10.1038/ncomms13686

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The energy spectra of electrons (a), γ-photons (b) and positrons (c) at t=34T₀, 36T₀ and 40T₀. (d) The laser energy conversion to the trapped electrons ρ_e(%), γ-photons ρ_γ(%) and positrons ρ_e+(0.01%), defined as the energy conversion efficiency ρ, as a function of the interaction time t.