Transmission spectra around the sodium doublet for the three epochs. The three upper panels are the transmission spectrum of each individual epoch. Grey lines are the transmission spectrum. Black dots are the data binned by a factor of 30 and 15, for the upper and middle two panels respectively, error bars are calculated as the standard deviation of the data inside the bins, and red lines are the predicted signal of the petitRADTRANS model. The bottom panel shows the combined data at a different binning. The light blue area shows the 95% confidence region assuming a Student’s t-distribution. Vertical blue lines indicate the core of the sodium doublet in reference to the host star.