EFHI: growth rates (top) and real frequencies (bottom) derived for a dual model comprising a Maxwellian core and a bi-Kappa halo (κ = 2) with κ-dependent temperatures (solid lines), κ-independent temperatures (dashed lines), or their bi-Maxwellian limit (κ → ∞, dotted-lines). The plasma parameters for electrons are given explicitly in each panel and for protons are A_p,c = A_p,h = 1, β_p,c = 1, β_p,h = 4.