Upper panels: PMs versus RVs for BRC and FRC sample. Color lines (red for BRC and blue for FRC) shows the linear regression for our data in the respective sample. As is shown in the right upper panel, no significant difference in μ_b versus RV is observed, while for μ_lcos   (b) a common trend with RV is found (left upper panel). Under each scatter plot is also shown the scaled RV distribution for each sample to define a pure BRC and FRC sample (red and blue dashed regions, respectively). Lower panels: histograms for observed proper motions and the difference in the median for selected stars in each pure sample defined above.