Graphical demonstration of our contamination/detection method for target Kap Psc (distance: 50 pc). The red markers indicate proper motion compatible sources (with 3σ uncertainties) and the grey markers indicate incompatible sources. The blue shaded space is the 3σ boundary of the proper motion of the primary target. The extent of the angular query is 2000′′, equivalent to 100 000 au at 50 pc.