Optical properties for three dust models. From left to right: the opacity per unit gas mass, assuming a gas-to-dust mass ratio of 100 (κ_ext;λ); the scattering albedo ω_λ; the forward throwing parameter g_λ; and the polarization for the scattering angle of 90°. The gray vertical solid lines indicate three representative wavelengths for our calculations (3.5, 4.8, 12 μm; see text for details). The gray vertical dashed line indicates the wavelength for H band, for which we used imaging polarimetry to model the images for longer wavelengths. The dust opacity κ_ext;λ is shown for the optical to mid-infrared wavelengths, while the remaining parameters for scattered and thermal emission are shown for near- to mid-infrared. The variations of optical properties at λ ~ 3 and ~10 μm are due to water ice and silicate, respectively.