Symmetric logarithmic representation of the real, panel a, and imaginary, panel b, part of the function $1/{\epsilon }_L^{Max.}$, defined in Eq. (3), with f / f_pe = 1.08 and f_pe/ f_ce = 2.2. The solutions for the Langmuir and Bernstein eigenmodes are presented as lines and were obtained numerically by solving the plasma dispersion relation with the solver WHAMP (Roennmark 1982), while the angle for the oblique fluid pole was obtained in the fluid plasma limit (Fisher & Gould 1971).