Complex eigenfrequency plane showing the solutions (solid dots) to the dispersion relation in Eq. (C.23) forthe given background plasma properties and wavenumber. The top and bottom panels show the solutions for the weakly and strongly radiative cases, respectively. Green, red, blue, purple, and black show the slow, Alfvén, fast, thermal, and radiative diffusion modes, respectively. The inset plot shows all modes except the Alfvén mode using a logarithmic scale to compare the relative magnitudes ofthe imaginarycomponents oftheireigenfrequencies.