Mean residual velocities shown as a function of the three position angles (α, β, γ) for the two subsamples in the top panel for M 67 within 5r_J. Difference (∆) in the mean residual velocities ($v_{x_c}$, $v_{y_c}$, and $v_{z_c}$) of the two subsamples is displayed as a function of the position angles (PA) in the bottom panel. Error bars (in gray), best-fitting sine functions (in red), and the initially fitted angles are also shown.