Cross-correlation results around the Hα line of the first night. Top panel: K_p map of the cross-correlation values. The cyan-dashed line indicates the K_p position with maximum S/N. The horizontal black dashed line shows the predicted K_p = 188.15 km s⁻¹ value, the cyan-dashed line the K_p ~ 340 km s⁻¹ at which the S/N is maximum, and the vertical black dashed line shows 0 km s⁻¹ shift. Bottom panel: cross-correlation values extracted at the maximum S/N K_p (cyan), and at the predicted K_p (black).