Fig. 1
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Spatial distribution of σ-Orionis sources (points), and massive O-B stars (star symbols) in the cluster. The massive, multiple system σ-Oriis indicated in cyan while the rest of the B-type stars in gray. The color bar shows the incident FUV field strength (in terms of the dimensionless parameter Go) due to the massive stars. Black circles show projected distances of 0.5, 1.2, and 2.0 pc.
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