Results from SED analysis for IK Tau and IRC +10216. The left panels show the observed fluxes in blue (see Table A.2) and the calculated SED from the best DUSTY model in red. The right panels show χ² as a function of the dust temperature at the condensation radius, T_d(r_c), and the logarithm of the dust optical depth at 10 µm, log τ₁₀. The white contours correspond to 1, 2, and 3σ levels. Similar plots for other stars are shown in Fig. A.2.