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Fig. 4

image

Lyman-α line flux integrated over bands of interest in Visits A, B, and C as a function of time relative to the mid-transit of GJ 3470b (contacts are shown as vertical dashed lines). The spectral ranges of the bands are indicated in each sub-panel. For all visits, blue and red points correspond to bands showing absorption in the blue and the red wing, respectively. We note that the bands were optimized for all orbits in a visit, and do not necessarily show the strongest absorption in a given orbit. Black points correspond to the complementary of the absorbed regions up to the limit of the wings. Visits A and B show stable flux levels in the wings, except for a flux spike at the peak of the red wing in Visit B orbit 1, while Visit C displays short-term variability. Fluxes are normalized by the average flux over orbits 1, 2, and 5 (excluding spurious ranges in the red wing for Visits B and C, see text).

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