Reconstructed images in the N band. They have 512 × 512 pixels with 0.59 mas pixel⁻¹ and are convolved with the interferometric beam (Fig. 1). The peak intensity is normalised between [0,1] and the corresponding noise maps are shown in Fig. A.2: the highest noise value is ~ 3 × 10⁻⁵. The contour lines correspond to [0.20, 0.30, 0.40, 0.50, 0.70, 0.95]. East is to the left, north is up. As reported in Sect. 2.2, the data quality of the images at wavelengths between 9.3 and 9.9 μm, is compromised by the telluric spectrum at the observing site.