Observable signatures during the transit of an exoplanet covering 1.5% of the surface in a hotter (“F3 V”; left) and a cooler star (“K8 V”; right). Top row shows line profiles in integrated starlight for three rotational velocities V sin i = 1, 3 and 5 km s^-1. Middle row shows spatially resolved line components at four different center-to-limb positions. Such profiles can be disentangled from observations as in the bottom row: ratios of observed line profiles at each transit epoch to the line profile outside transit. Red solid curves show these ratios at a planet position in front of stellar disk center. Curves for positions from disk center toward the limb in a prograde planetary orbit are represented with successively shorter dashes. Dotted green curves indicate the corresponding planet positions on the ingress side of the stellar disk; because of stellar line asymmetries, these do not exactly mirror those on the egress side.