Fit of an elliptical, two-component Gaussian model to all derived visibilities V_circ of the circumstellar environment (i.e., exclusive of the central star). Top: uv coverage of the observations (white dots) and our elliptical, two-component Gaussian model consisting of a compact and an extended Gaussian (see Table 2). Bottom: observed visibilities of the circumstellar environment (at four different PAs; color-coded) and visibility cuts (four lines; same color-coding as the observations) through the visibilities of our two-dimensional, elliptical Gaussian model. We fitted this two-dimensional Gaussian model to all visibilities instead of fitting one-dimensional visibility models to the visibilities corresponding to a single PA. (This figure is available in color in the electronic form.)