Q_ϕ maps (logarithmic stretch for the inner inner 200 AU × 200 AU) synthesised for SPHERE+IRDIS’s H-band (λ_obs = 1.6 μm); (τ = 1)-surfaces from r = 0 and from z = ∞ added as dotted white and black lines, respectively. No distinct difference emerges between the disks without (first and fourth columns) and with (second and third columns) a dusty wind; the difference between the ‘fixed’ and ‘variable’ dust scale heights has a much larger impact on the synthesised instrument response.