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Fig. 2
First three observed moments of the Si ii λλ6347,6371 and He i λ6678 lines (dots). ⟨ ν ⟩ , ⟨ ν2 ⟩ , and ⟨ ν3 ⟩ , have units km s-1 (km s-1)2, and (km s-1)3, respectively. The solid lines represent the best-fit sine curves to the first and third moments.
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