Time series of atmospheric temperature and He column density for the observation day January 26, 2023. Blue and gray points represent the 20 x binned and unbinned best-fit planetary parameters obtained from fitting the planetary absorption spectra as described in Sect. 3.3.2. The red line marks the weighted average of each retrieved parameter and the orange band represents the 1σ region around this average. The black line shows the input values used in the simulation. We provide axes for the width in km/s and depth in % to facilitate the understanding of the analogy between temperature and width, and column density and depth.