WHFI solutions derived with DIS-K for a Maxwellian core and different halo-strahl combinations (legend): Maxwellian halo and strahl (blue), SKD halo and Maxwellian strahl (red), Maxwellian halo and SKD strahl (green), and SKD halo and strahl (black). The growth rates, γ/|Ω_e| (right), show two peaks of instabilities with the same RH polarization indicated by the sign of ω_r/|Ω_e|> 0 (left). The parameters used are indicated in the title.