Fig. 2
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Ingredients and outcome of the spectral data reduction. The top three panels show the GRAVITY on-axis contrast spectrum, the associated stellar calibration flux spectrum, and the resulting companion flux spectrum. The same is visualised for the off-axis observation in the three middle panels. Finally, the bottom panel shows the on- and off-axis companion flux spectra alongside the combination of the two. This K-band spectrum of HIP 99770 b is used in Sect. 4.
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