Spatial densities predicted at three past epochs: 1, 0.67, and 0.33 Myr (from left to right) in the past, plus the present one (on the right). As indicated in the panels, only stars with PM uncertainties < 0.4 mas yr⁻¹ are used and the maximum 1σ uncertainties for the reprojected position are indicated by the red cross in the upper-left corner. The density maps are smoothed with an adaptive kernel as in Fig. 7.