Cross-correlation functions of the transmission spectrum corrected from the telluric features (black) and noncorrected (gray) in the stellar rest frame using the water vapor mask at 296 K for both nights (2019-02-24 and 2019-03-17 from left to right). For the 2019-02-24 night, the dashed orange CCF shows the impact of 20 deepest telluric lines if they are not masked. The blue dashed line shows the observer’s radial velocity, where telluric residuals would be expected.