Eigenfrequency spectrum in the complex plane at m = 8 for (a) δ = 10⁻⁶, Ω = Ω₀, (b) δ = −10⁻⁶, Ω = Ω₀, (c) δ = 10⁻⁶, Ω = 0, and (d) δ = −10⁻⁶, Ω = 0, respectively. Here, Ω₀ is the Carrington rotation rate. Only inertial frequency range is shown. Upper and lower panels: cases with and without uniform rotation. Left and right panels: cases with superadiabatic and subadiabatic background. Panel a: is the same as Fig. 2b.