Fig. 9.
Panel a: temperature probability distribution of silicate grains in the diffuse medium of the 13 Gyr-old Milky Way model. Grain radii are color coded as indicated on the plot. Panel b: emission spectra of these grains (same color coding for grain radii as in previous subfigure). The quantity Xλ is the spectral exitance (luminosity per unit surface of the grain).
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