Best-fit geometric models to the 10.6 μm visibilities. The observations are shown as crosses with error bars; the color corresponds to the position angle of the measurement, shown in the color bar at the top of the plot. The 1D model is shown as a solid line, and the 1DOR model is shown as a dotted line. The triangles show the 2DOR model, while the squares show the 2D1D model. For a description of the different models, see Sect. 4.1.