Fig. B.1
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Variations in the atmospheric conditions during the IFS 2017-09-28 observations. Top: Telluric absorption as traced by SPHERE/IFS at ≈ 1.4μm. Middle: Sky infrared temperature as traced by LHATPRO. Bottom: PWV as traced by LHATPRO. The vertical dashed line in all figures marks our cut-off time for the first 140 IFS frames, which form the basis of our spectral analysis, out of a total of 154 IFS data frames.
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