Fig. A.1.
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Wavelength calibration accuracy, Δλ/λ, as a function of wavelength for each GRAVITY snapshot, as determined by PMOIRED fitting of telluric features. R is the spectral resolution and < err> is the error in the wavelength calibration averaged across the full K-band range. An accuracy of 0.001% in the K band corresponds to ∼3 km s−1.
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