Selection RVs. We take the cluster named ESO 92-18 as representative, as it is in the direction of this cluster that we identified the highest number of stars with RVs. We show the position (left panel) and PM (in the middle) diagrams for the PM-selected ESO 92-18 stars (black points) and for stars with RVs. We also display the RV versus G-magnitude diagram (right panel), where we show selected RV values for those stars that are likely members of the cluster (red points) and those excluded because they show a very different RV with respect to the RV cluster mean. In the insert, we plot the normalised histogram for the sample, and we over-plot the Gaussian fit for the whole sample (yellow line) and for the selected stars (red line), showing how both means and standard deviations change in the two cases.