Top: representative CCF obtained with an injected signal at the expected level (magenta) and without an injection (black) at a K_p of 180 km s⁻¹ and v_wind = 80.6 km s⁻¹. The difference between both CCFs is shown in grey and its peak is marked with a star symbol. The illustration corresponds to the results of N_{A, 1}. The CCFs for the other nights have similar shapes, but different peak values. Bottom: Peak differences between the CCFs with and without an injection for all HD 209458 b (left) and HD 189733 b (right) data sets.