Fig. 3.
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The σ Orionis star-forming region in the sky. It comprises three prominent subcomponents (the σ Ori cluster, the RV Ori association, and the Flame association) as well as a halo. The Flame Nebula Cluster (NGC 2024) is located in the same region but appears younger. The right panel shows the central area of the region on top of the Digitized Sky Survey image from Aladin (Boch & Fernique 2014). Each of the populations has its distinct transversal velocities (shown in arbitrary units).
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