Dispersion relations at 08:00 on 20 January 2015. a) Real part of ω as a function of wave number. b) The imaginary part of ω as a function of wave number. For growing modes γ< 0 and for damped modes γ> 0. The red, blue, and green curves correspond to the distribution functions shown in Figs. 4d and g by the red, blue, and green curves, respectively.
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