Fig. 10
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WISE 22 μm image of the field containing Vela X-1. The position of the bow shock generated by Vela X-1 is indicated by a black contour. The area surrounded by a dashed white circle of radius of 0.27° corresponds to the putative Strömgren zone produced by Vela X-1. The external green contour corresponds to 3σ of background surface brightness.
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