Wave-number dispersion for the fastest-growing unstable modes (with maximum growth rates) in case 1.c, corresponding to different angles of propagation (θ) and different ranges of unstable wave-numbers: BEFI at θ = 65° (black), oblique HFI at θ = 45° (green), and FHFI at θ = 0° (orange). Top panels: wave frequency (left), growth rates (center), and polarization (right). Middle panels: longitudinal and transverse components of the wave electric components. Bottom panels: cartesian components of the wave magnetic field. See further details in the text.