Bayesian analysis showing the probability densities of the physical parameters associated with the core (blue histograms), disk (green), and envelope (gray). Panels a–d: results for the free physical parameters (T_dust, τ₁₀₀, N(H₂O), and n(H₂)); panels e-i: results for the derived parameters (X(H₂O), R, L_IR, and the fractions f of the 448 GHz continuum and of the H₂O448 emission that arise from each component). The small arrows at the bottom of each panel indicate the values of the fiducial model in Fig. 6. In panel h, the contribution f to the H₂O448 line from the envelope is not shown because it is negligible in all models. The median and 90% confidence intervals are listed in Table 2.