Population profiles of different levels along the planet-star line at the day side (x > 0) and at the night side (x < 0). The left panel shows the hydrogen densities calculated by model (solid) lines and the corresponding LTE values (dashed). The center and right panels show the levels’ profiles as beta-factors (i.e., density values normalized to LTE values) for Mg I, Mg II, and O I, C I, C II.