Fig. 4
Spectro-photometric light curves of the He (23S) absorption of the transit of GJ 3470 b for each of the three nights: 1 to 3 from top to bottom, respectively. The light curves have been constructed using three different wavelength integration intervals: 0.40 Å (green), 0.74 Å (blue), and 0.97 Å (red). Note the differentabsorption scale between night 1 and nights 2 and 3.
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