Comparison of dust emission spectra and their MBB fits. The black and purple lines show the emission spectra for Default and LGM models with grains at 15 K temperature. The dashed lines show MBB spectra fitted to the 250, 350, and 500 μm points. The resulting fit parameters are T_c = 16.48, β = 1.62 and T_c = 15.85, β = 1.79, for the Default and LGM models, respectively. The red curve (scaled by a factor of 1.0 × 10⁻³⁰ to fit the figure) is from a simulated Default model map pixel where the fitted temperature is similar to that of the black curve. The blue vertical lines show the 250, 350, and 500 μm frequencies.The relative differences between the black-bodies and the MBB fits near the 250, 350, and 500 μm points are shown in the plot below the emission spectra curves.