Same as Fig. 7 but with a flat compact disk as the central illuminating source and the ‘Dust3’ model. The white dotted contours in the left two panels indicate the disk surface aspect ratio z_disk/r = 0.5 and the radial inclination of the disk surface δ = 30°, respectively, for the extended disk. The blue and black contours in the right two panels indicate the optical thicknesses τ = 0.35 and 0.7, respectively, in the extended envelope. The gray circle in each panel shows the area where we were not able to execute reliable calculations because of the bright central source in the PI image. The other gray areas indicate the regions where we have not been above to execute self-consistent calculations (see the text).