Gaia DR2 proper motions for possible members of Wd 1. The small filled (violet) circles are spectroscopically selected cluster members that form a subset of the “clean” population defined on the basis of proper motions and parallaxes; the remaining members of this grouping (i.e. those stars without spectral classifications) are shown as black dots. Larger (blue) circles are spectroscopically selected members with astrometric properties compatible with the cluster averages within approximately two of their own error bars. Diamonds are spectroscopic cluster members that are not compatible at 2σ in at least one of the three astrometric values. The large (red) circle represents the average cluster value. Its error bars are the median value of the errors for the sample of objects used to calculate it.