Application of our custom wavelength calibration to the spectrum. Upper panel: spectrum calibrated using daytime arc lamp images as provided by the standard pipeline when OH sky emission lines are hidden by the stellar PSF. Lower panel: spectrum calibrated using our custom pipeline. We provide the telluric transmission template used for the calibration as reference (orange). We only show the region between 2.375 μm to 2.4 μm to easily distinguish the telluric lines by eye.