Fig. 1.
Vector-point diagram of proper motions of NGC 3603, along with RFS 7 and 8 normalised to the cluster centre. The black dots and the associated error bars are the proper motions of O stars meeting our quality criteria, and the red dots are those of RFS and 8. The grey dots are the proper motions of all stars meeting our quality criteria within 5′ of NGC 3603. The ellipse marks the boundary of the cluster motions (including errors).
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