From top to bottom: CI Tau’s ALMA Band 7, 6, 3, and VLA Ka band continuum emission. Left column: CLEAN images. Central column: Azimuthally averaged surface brightness radial profiles. Those obtained from the tclean images are in violet, purple is used for the best-fit frank profiles (a point-source component was subtracted from the 3.1 and 9.1 mm visibilities before fitting). Right column: residual images of the frank fit. Dotted ellipses mark the location of the dark rings in the CLEAN images. The synthesised CLEAN beam is shown as an ellipse in the bottom-left corner of each image and as a segment with full width half maximum equal to the beam minor axis in each radial profile subplot.