S/N of the Fe I absorption signal in the CCFs computed for the T1 planetary spectrum with varying veiling levels, ranging from r = 0 (no veiling) to r = 1. The dashed black line indicates the reference 2σ, set as the detectability threshold for the purpose of this diagram, while the dashed red line marks a veiling factor of r > 0.3, beyond which the planetary signal is not recovered.