Results of the FT data fit. Top: MCMC marginal posterior distributions of the fitted parameters. The blue lines identify the median of the distributions for the geometrically thin ring model (left) and for the Gaussian-convolved infinitesimally thin ring model (right). Center: Comparison between the model squared visibilities (blue dots) and the observational data (white–black dots). The red dots represent the absolute residuals. Bottom: Vis² best fit to the geometrically thin ring model (blue continuous line) at λ=2.153 μm for three different position angles identified in the insets. The visibility data are shown for all spectral channels by the red circles.