Comparison between v_z, gas and 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, kSZ = v_z, gas, and the colored regions represent the rms scatter of the v_z, kSZ = v_z, gas line at given x-axis for all galaxy clusters in our sample. The dashed lines are the best-fit lines of the data points, and ‘m’ in the legends are the slopes of the best-fit lines.