Fig. 1
K-band flux-calibrated spectrum of 51 Oph for the May 2017 dataset. The dashed red line shows the adopted continuum distribution, computed as the sum of a black body at T = 10 000 K, which contributes 80% to the total flux, and a 20% contribution from a black body at T = 1500 K, approximately the silicate sublimation temperature (Lazareff et al. 2017; GRAVITY Collaboration 2019).
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