Left: K_s magnitude distribution of candidates. Based on Table D.1. Errors in magnitude are not considered. Right: residual motion of candidates. For all candidates detected in two epochs, the figure shows the residual shifts in right ascension and declination over the time elapsed between the epochs (Table D.1) after correcting for the proper and parallactic motion of the central stars (Table E.2). The symbols group the candidates according to their central stars. Error bars have been omitted for clarity.