Fig. 1
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L- and N-band MATISSE aperture-synthesis images of FS CMa: top: Reconstructed L-band image (3.4–3.8 μm). The inner dark disk cavity in the L-band image has anangular diameter of ~6 × 12 mas (i.e., ~ 3.7 × 7.4 au for a distance of 620 pc). Bottom: Reconstructed N-band image (8.6–9.0 μm). The FOV is 64 mas (39.7 au for a distance of 620 pc). North is up and east to theleft. The inserted circles represent the 2.7 and 6.6 mas diameters of the L- and N-band resolution beams. See Sect. 3 for more details.
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