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Fig. 11

Derivative of the vorticity, ∂Z/∂r, as a function of radius for orbit 50 (quiet state), orbit 150 (pre-outburst state), and orbit 200 (post-outburst state). The inset is a zoom-in of the region 1.2 ≤ r ≤ 1.4 where multiple changes of sign are clearly visible for orbit 150.
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