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Fig. 4.
From left to right: mean (black) and variance (red) residual profiles for Hα, Hβ, and HeI 587.6 nm. Hα and Hβ appear on overlapping spectral orders, which are both shown here. For HeI, the variance has been multiplied by 10. The increased scatter over the blue wing of the HeI line profile is due to spectral order overlap.
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