Parameters for disks and envelopes derived from the H band images. From left to right: the aspect ratio for the surface of the extended disk; the radial inclination angle for the surface of the extended disk; the optical thickness of the extended envelope in H band (λ = 1.65 μm) from the central star in the radial direction; the same but for line of sight of the observations. The calculations are made for with the ‘Dust1’ model. See the text for the other parameters used to derive the aspect ratio and the radial inclination of the disk surface. The contours show the brightest regions for the PI distribution in H band, for which we arbitrarily selected the contour levels to indicate the locations of the arm-like structures. 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.