IRS spectrum and photometric data of 04108+2803B and an envelope model fit with ﹩L=0.7﹩ L_⊙, ﹩\rho _{1}=1.5\times 10^{-14}﹩ g cm⁻³, ﹩R_{c}=40﹩ AU, initial TSC density distribution, ﹩\eta _{\mathrm{star}\,}=0.3﹩, ﹩\theta =10^{\circ }﹩, ﹩i=40^{\circ }﹩, an inner disk radius of 3 stellar radii, and an outer envelope radius of 6000 AU. The CO₂ ice abundance was set to ﹩1.0\times 10^{-4}﹩. The gray lines represent the model components as in Fig. 5.