Fig. 3
Intrinsic Mg i stellar absorption line profile of HD 209458 as observed with HST/STIS at 2852.9641 Å (Vidal-Madjar et al. 2013). The ratio β between radiation pressure and stellar gravity (right axis) is proportional to the line flux. Note that β is larger than 1 (horizontal dotted line) for velocities outside the range −10 to 15 km s-1, and increases steeply farther away in the wings of the line.
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