S/N as a function of the number of singular values removed. The blue and red curves show the S/N of CO and H₂O model injections at the expected orbital parameters, respectively, while the observed signals are shown in black solid lines. The lighter colored lines correspond to 100 random injections in the region K _p ∈ [100, 300] km s⁻¹ and V _sys ∈ [ −100, 100] km s⁻¹. The S/N of the injected models was rescaled to match the S/N of the real signals. The vertical dashed lines show the optimal number of singular values that maximizes the injection S/N at the expected orbital parameters.