Motions of companion candidates measured on the sky relatively to their respective primary stars (at (Δα,Δδ) = (0,0)). The theoretical motion of an object is calculated from its initial first epoch measurement (black filled circle) assuming it is a background contaminant and given the proper and parallactic motions of the primary star (black curve), for the different epochs where measurements have been recorded (empty circles). The measured positions for these different epochs are reported (filled circles) for comparison. When the measurements (filled circles) agree with the theoretical motion path, the companion candidate is likely a background contaminant.