Spectral profiles of GJ 3470’s Lyman-α line as observed with COS, still contaminated by geocoronal emission. From top to bottom: the rows correspond to Visits D, E, and F. Successive orbits in each visit are plotted from left to right. Each HST orbit is cut into four sub-exposures, plotted in blue, orange, green, and red, with increasing phase. Spectra are shown in the COS rest frame.