v_rad vs. ϕ₁ plot for the separated stars between the narrow and broad components. The radial velocity is obtained from measurements by the S⁵ survey. When isolating the stars that show a trend in radial velocity i.e., those included in the dashed gray lines, we observe a separation between the two components in radial velocity. A zoom-in plot of the considered region is plotted in the bottom left corner. Stars belonging to the narrow component additionally show a narrow spread in radial velocity compared to the more dispersed broad component.