Complex eigenfrequency plane showing the solutions to the adiabatic (solid dots) and non-adiabatic (crosses, plusses) dispersion relation for the values in Table 1. The wave number k = 2π/L and θ = π/4. Red, blue, black and green denote the slow, fast, Alfvén and thermal modes, respectively. Crosses denote the isochoric growth rates, the isobaric ones are given by a plus. Inset: zoom-in near the fast and Alfvén modes.