Proper motions of VFTS 16 and 72 relative to the cluster R136, that resides within the centre of the association NGC 2070. The lengths of the arrows are scaled to their tangential proper motions. Red arrows indicate the projections of these stars’ proper motions backwards in time, scaled to their ages, and their approximate opening angles, from Table 1. The green arrow denotes the denotes the distance the star would cover to R136. The other major grouping of O-type stars in this region, NGC 2060, is also indicated.