Fig. 3
Zoom on the Lyα line of GJ 436 measured with STIS/G140M with error bars from the STIS pipeline (blue curve). The STIS spectrum of HD 209458 obtained by Vidal-Madjar et al. (2003) is shown for comparison (grey curve). As seen from Earth, the nearby M dwarf clearly shows a more intense stellar emission and a narrower ISM absorption. The location of the air glow (subtracted here) is indicated by green hatches.
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