The about 2 million Gaia DR3 sources in the region contained by Vel OB1. The members proposed by Humphreys (1978) (orange) and Reed (2000) (blue) are indicated. Open circles refer to non-members (see Tab. A.1). The black and green triangles represent the runaways with (Runaways BS) and without (Runaways nBS) an observed bow shock. Open triangles refer to candidate runaways (see Tab. A.2). Upper panel: The parallax distribution as a function of Galactic longitude. Lower panel: The position of known young clusters in the distance range of Vel OB1 in Galactic coordinates. The approximate size of the young clusters in this region is marked by a dashed circle and labelled. The foreground cluster RCW 36 (0.7 kpc) is located at l = 265.1 and b = 1.4 and has a reddening A_V ≥ 8 mag (Ellerbroek et al. 2013); the latter explains the low stellar density in this area. The [KPS2012] MWSC 1594 open cluster is referred to as Cl 1594.