Panchromatic radiative transfer model predictions based on the best-fit FitSKIRT models for THEMIS MW dust and the bare silicate dust mix. A single (10 Gyr) stellar population was used for the intrinsic SED of the stellar component. No additional dust heating sources are adopted in the model. The green line represents a modified black-body fit to the Herschel fluxes from 100 to 500 μm; a free β matches the steep Rayleigh-Jeans slope.