Spectral energy distributions (observed frame) of D49 and M28, including IRAC 8 μm, MIPS 24 μm PACS 100, 160 μm and SPIRE 250, 350, and 500 μm and MAMBO 1.2 mm data points (red dots). The observed data are overlaid with the best-fit DL07 model (black line). The “PDR” and diffuse ISM components are shown in cyan and orange, respectively, while the stellar component is depicted with a green dashed-dotted line. On the top right of each panel we list the derived parameters from the SED modeling, including U_min (radiation field of the diffuse ISM), γ (the contribution of the PDR component in the total SED), q_PAH (the fraction of dust in PAHs) and ⟨ U ⟩ (mean radiation field).