Power spectra of the GONG++ flow components and synthetic Rossby waves in the Stoneyhurst coordinate system at the equator. From the top to bottom panels are: the u_y flows, radial vorticity, and u_y component of synthetic Rossby waves (e.g., Hanson et al. 2020). Modes rotating at frequencies of multiples of Ω_eq are indicated by the vertical gray lines. The vertical red lines show the rotational frequencies of the sectoral Rossby waves. We have considered only the m >  2 sectoral Rossby waves seen in the Sun.