Normalized growth rate, γ/ω_pc vs. normalized wavenumber kλ_Dc from Eq. (4) for the IIAI with parameters given by Table 1. Panels a, b, and c depict Series 1, 2, and 3, respectively, with the fiducial run shown by the gray curve. These theoretical expectations are compared with simulation results in Table 2. The vertical dashed lines refer to the simulated wavenumber (kλ_Dc = 0.126).