(a) Root-mean-square (RMS) amplitudes of the velocity eigenfunctions of the HHS22 modes from the linear analysis, where the average is taken over the spherical surfaces. Dashed and solid curves show the results from model 2 (without differential rotation) and model 3 (with differential rotation). Different colors show different azimuthal orders m. The eigenfunctions are normalized such that the maximum horizontal velocity at r = 0.985 R_⊙ is 1.0 m s⁻¹. (b) Spectra of volume-integrated kinetic energy of the HHS22 modes. The blue and red points denote those from models 2 and 3, respectively.