Fig. 5.
Left: proper motion diagram of the stars in the 25 Ori region defined in the text (black dots), of the stars belonging to group B0 (blue dots), and of the stars belonging to group B0, b (light blue empty squares) and B6 (pink crosses). Right: sky distribution in galactic co-ordinates of group B0, B0, b, and B6. The colours and symbols are the same as on the left.
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