CCF constructed using templates for Na, K, FeH, V, and TiO. The x-axis indicates the offset relative to the line of sight velocity of the stellar system (V_LOS), while the y-axis displays the range of Doppler velocities (K_p) associated with the planet’s orbit around the star. The CCFs are presented in S/N units to facilitate interpretation. White lines mark the predicted velocities for both the star and the planet, serving as a guide. The bottom part of the figure zooms in on the CCF at the expected K_p velocity, offering a detailed view of the search for atmospheric signals.