Left: distribution of the stars from the BS in the tangential velocity plane ΔV_∥, ΔV_⊥ (see text for further explanation). The zero point is the predicted value derived from the space motion of Praesepe. The ΔV_∥-axis points in the direction of the CP. Stars are colour coded by their individual probability of contamination p_cont. Right: distribution of the same stars in the Y_P, X_P-plane. In this figure we use a Galactic Cartesian coordinate system with origin in the centre of the Praesepe cluster and not, as usual, in the barycentre of the solar system. Praesepe and its tails are represented by the large dark structure at X_P, Y_P = (0, 0). The over-density at X_P, Y_P = (445 pc, 220 pc) is the open cluster Collinder 350.