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Fine‐structure mid‐infrared emission lines with critical densities in the regime 104 ≤ ncrit ≤ 106 cm−3 can be employed to probe the outflow from Wolf–Rayet (WR) stars at radii of ∼1015 cm. Narrow‐band mid‐infrared imaging and spectroscopy of the nearest WR star to the Sun, γ Velorum is analysed for spatially resolved forbidden line emission in the WR outer wind. The [S iv] 10.52‐μm and [Ne ii] 12...
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