GRAVITY observables and model fits. In the upper left of each panel, the (u, v) plane coverage is shown. Each symbol corresponds to an individual exposures and the colors refer to the interferometric baselines. The other panels of the plot show the squared visibilities (right) and closure phases (left) for each baseline or triplet as a function of wavelength. The white markers with black contours represent the observational data and the black lines correspond to our best-fit model. The black markers on top of the lines indicate which curve corresponds to which exposure.