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Fig. 1

image

Our final sample of Hipparcos OB stars on the sky, plotted in Galactic coordinates. The dashed line shows the orientation of the Gould belt according to Comeron et al. (1992). Colored points indicate the stars that are identified members of the OB associations Orion OB1 (red), Trumpler 10 (purple), Vela OB2 (blue), Collinder 121 (green) and Lacerta OB1 (cyan).

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