Comparison of the Lyman-α flux between Visits 1 (blue), 2 (green), and 3 (red), integrated in complementary bands. All spectra have been interpolated over a common wavelength table before being summed, from top to bottom, in [−300; −183] km s^-1, [183; 300] km s^-1, [−33; 33] km s^-1, [−183; −39] km s^-1, and [39; 183] km s^-1. Squares correspond to the spectra measured during each HST orbit, and dashed lines to the reference spectra.