Density profile of the ionized photo-evaporation flow inside IC 434. The contribution of the Horsehead is plotted in red, which is only a small disturbance at the start of the flow. Small artifacts in the observed density profile persist after subtraction of background/foreground stellar features not associated with the flow. The observed profile reveals an exponential density gradient and is fitted using an appropriate density law (dashed line; see text). σ Ori AB is located at a distance of 3.2 pc.
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