Real part of the visibilities, averaged in 400-meter UV radius bins, compared to various models: (i) point source, (ii) disks with apparent sizes of 9.5, 20, 40, and 60 mas, and (iii) sum of a point source and a coma. The visibilities are rescaled to 233 GHz, and the UV radii are expressed in terms of the wavelength (kilo-λ). The dashed orange curve indicates the strongest coma signal that can be accommodated by the data.