Equilibrium dust temperature profiles as a function of density, calculated for the five distinct grain populations (black lines; model M4) or over the entire distribution (green; models M1 and M3). The effective grain radius increases with bin label as indicated in the plot. The red line shows the T_dust profile from Keto & Caselli (2010). The inset shows a zoom-in of the n(H₂) = 10⁴ cm⁻³ to n(H₂) = 10⁵ cm⁻³ density regime, excluding the result for the full distribution.