Fig. 1.
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Sketch of the environment, with the distances not shown to scale. The corona (in purple) has a radius of rcor ∼ 10−4 pc. The torus (in light blue) has a radius of rtor = 3.6 pc. The C, NE, and P1–P4 knots are shown in red, dark blue, and green, respectively. The radii of the knots and respective distances, z, from the core are summarised in Table 1.
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