Scattered-light intensities for λ_obs = 0.7 μm for TD20; different models in different columns, and different inclinations in different rows. An artificial coronagraph of r = 1 AU is used to mask out the direct stellar signal. The max (I) for the scaling of the colourbar is taken for each image individually (after application of the coronagraphic mask). The orange and blue lines in the (i = 90°)-row represent the (τ = 1)-surfaces for an observer at r = 0 and z = ∞, respectively. At low i, the dusty wind obscures the cavity; at higher i, it produces a cone-like feature around the z-axis.