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Fig. 8

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Two-dimensional map of HD 209458 during a transit by its planet (first night), in the stellar rest frame. Top: in- to out-of-transit flux observed by ESPRESSO on 2019 July 20. Bottom: in- to out-of-transit flux produced with the best-fit 3D NLTE synthetic spectra. The dashed white lines represent the beginning and end of the transit.

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