Top panel: transmission spectrum of WASP-107b in the region of the He I triplet (black points) in the planet frame. The red line shows the theoretical profile obtained with the EVE code for the model shown in Fig 6. The green line shows the contribution from the model thermosphere alone. The three vertical grey dashed lines correspond to the helium triplet transition. Bottom panel: helium light curve integrated from 10 832.80 to 10 833.55 Å from the observations (black), the theoretical atmospheric continuum (grey) obtained with Batman, and the simulated EVE atmosphere (same colour code as the top panel). The two vertical black dashed lines correspond to the contact points t_I and t_IV , and the two vertical grey dotted lines correspond to t_II and t_III.