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Fig. 3.
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a) Growth rate map for the beam-plasma instability, Γ(k∥, k⊥). The green line, k⊥ = k⊥(k∥), marks the local maximal growth rate. b) Growth rate for longitudinal modes, Γ(k∥, 0). c) Growth rate on the line of the maximum, Γ(k⊥).
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