Average transmission spectrum around the He I triplet in the planet rest-frame. The positions of the three helium lines are marked by vertical lines. The red curve is the best-fit Parker wind model obtained for a temperature of 6000 K and a mass-loss rate of 4.2 × 10⁹ g s⁻¹. The blue line indicates a model for a tentative blueward component centred at around −13 km s⁻¹. The magenta dashed curve is the combination of the red and blue lines.