Plummer plus Gaussian best fit (orange) overplotted on the real and imaginary parts of the visibilities for the B3 (upper panel, black points) and B6 (lower panel) observations of CB68. The Plummer only (violet line) and Gaussian only (green line) components of the total model are also shown. The wiggles in the model are due to its sampling on the uv-points of the observations. The residuals of the model are shown in green at the side of each plot. The corner plots are shown for completeness and the parameters values reported in Table 2 for readability.