Data for the star and companion obtained on 2023-11-23 and extracted using our custom pipeline. The read-out noise of the detector is also plotted to demonstrate that the data obtained on the companion has a mean S/N of ∼25 per spectral channel at the center of the H band. The effect of the telluric lines is clearly visible at the start and end of the band, but also close to the center where many telluric CO bandheads are visible. We remind that data for the companion refers to the spectrum at the location of the companion which contains primarily stellar flux.