Center-to-limb variations in reconstructed line profiles. The solid blue curve is the average of five exposures near stellar disk center with mean μ = 0.86; the dashed dark red curve is the average over four exposures closer to limb, ⟨ μ ⟩ = 0.61. The fitted thin curves are modified Gaussians; the observed profile outside transit is bold dashed gray. The intensity scale is that of the stellar disk-averaged flux. Because of limb darkening, the local intensity close to disk center is higher, and that further away is lower than this average value. The planet size and disk positions are to scale.