Injection-recovery tests of KELT-9 b for different geometric albedo, A_g, and net rotational velocity, v_rot, values. The panels show S/N maps resulting from the cross-correlation of the reflection template with the CARMENES dataset, into which the respective artificial reflection signals were injected beforehand. The rotational velocity used to broaden the injected signal as well as the template increases towards the right. The geometric albedo with which the artificial signal and the template were scaled drops off towards the bottom. The positions at which the artificial signal was injected are indicated by the dashed black lines. The S/N value encountered at this position is shown in the white box in the top-left corner of each respective panel. Note that this value corresponds to the corrected S/N (hence the c subscript), that is, the signal strength normalised by the encountered signal strength at the same position in the absence of an injected signal.