Ly-α line of 55 Cnc in Visit A_fuv (indicated in blue, green, orange, and red with increasing orbital phase), contaminated by geocoronal emission within the range delimited by vertical dotted lines. The stellar line is retrieved by subtracting observational airglow templates adjusted manually in each orbit (dotted black profiles). No absorption by the planet is observed in the extracted stellar line during the in-transit orbit (orange). The stellar line has been centered in the star rest frame (vertical dashed black line).