ALMA 338 GHz continuum residual (i.e., data − model) images of Betelgeuse. The filled ellipse in the lower left corner of the left panel is the FWHM of the restoring beam and has dimensions 15 × 13 mas while the orange circle is the size of the infrared H-band photosphere from Montargès et al. (2016). Left panel: the residual image after a uniform elliptical disk has been subtracted from the visibilities. Middle panel: the residual image after a uniform elliptical disk plus an elliptical Gaussian have been subtracted from the visibilities. Right panel: the residual image after a uniform elliptical disk, an elliptical Gaussian, a circular Gaussian, and a thin ring have been subtracted from the visibilities.