Comparison between the LOS (z-direction) velocities of the galaxy clusters (v_z, halo) given by TNG300-3 and the velocities obtained with the SZ effect (v_z, kSZ) measured with different aperture sizes of 0.25R₅₀₀, 0.5R₅₀₀, R₅₀₀, and R₂₀₀, given the bounds for kT. The solid lines represent v_z, halo = v_z, kSZ, and the colored regions represent the rms scatter of the v_z, halo = v_z, kSZ line at given x-axis for all galaxy clusters in our sample. The dashed lines are the best-fit lines of the data points excluding |v_z, kSZ|> 500 km s⁻¹, and ‘m’ in the legends are the slopes of the best-fit lines.