Parameter maps from THEMIS fits of Y_aSilM5, Y_lCM20, and Y_sCM20 (first, second, and third rows, respectively) for the two-ISRF, multi-ISRF, and α_sCM20 free (first, second, and third column) models. The gray background represent all fitted pixels. We notice strong discrepancies from one model to another. The spatial variations are dependent on the dust heating environment, especially for the silicate and small carbonaceous grain components.