Models of a very inclined disk (i = 87°) with a ring at 2′′ = 90 AU generated for three anisotropic scattering factors (| g | = 0.10, 0.25, and 0.75 from top to bottom). The bottom panel shows the trace of the disk (elevation in arcseconds with respect to the position of the midplane) measured for each model (black, red, and blue lines). The measured elevation is perturbed for the | g | = 0.10 disk between 1′′ and 2′′, since we are fitting a single Gaussian profile while two appear on each part of the midplane as long as the disk image is nearly symmetrical. We indicate with black vertical dotted line the zones where we measure the slope and the elevation of the trace.