IRS spectrum and photometric data of 04154+2823 and an envelope model fit with ﹩L=0.35﹩ L⊙, ﹩\rho _{1}=7.0\times 10^{-15}﹩ g cm−3, ﹩R_{c}=10﹩ AU, initial TSC density distribution, ﹩\eta _{\mathrm{star}\,}=0.1﹩, ﹩\theta =5^{\circ }﹩, ﹩i=20^{\circ }﹩, an inner disk radius of 1 stellar radius, and an outer envelope radius of 5000 AU. The CO2 ice abundance was set to ﹩1.0\times 10^{-4}﹩. The gray lines represent the model components as in Fig. 5.