VPD for Alpha Persei. Top: blue dashed ellipses are the members taken from Gaia Collaboration (2018b); red ones are the LDB sample objects. Five sources (AP296, AP310, AP313, AP317, and AP322) possess a proper motion different from that of the rest of the members. AP272 is also shown (see the text). Uncertainties in the proper motions and its correlations are taken into a account and shown as ellipses. All data have been taken from the Gaia DR2 catalogue. Bottom: zoom on the previous plot.