Simulated data: cross-correlation signal-to-noise ratio (S/N_CCF) K_p−V_rest maps using a H₂O template with the HITEMP line list for a selection of simulated datasets constructed with the POKAZATEL H₂O line list. The leftmost column displays the results obtained with a C/O ratio of 0.1, and an opaque cloud top pressure of 1.7 log₁₀(Pa). Going to the right, the columns display the results from cloudless (P_c = 7 log₁₀(Pa)) simulated datasets, with C/O ratio of 0.1, 0.55, and 0.8, respectively. Negative values indicate an anti-correlation of the template with the data. The vertical and horizontal dashed lines show the expected K_p of the planet and the 0 km·s⁻¹ rest velocity, respectively. The red cross indicates the location of the maximum S/N. Rest velocities lower than −100 km·s⁻¹ and larger than +100 km·s⁻¹ are not shown for clarity.