Comparison of observed surface brightness and DustEM models normalized to the 3.3 μm observed band (without radiative transfer) in the H II (upper), atomic (middle), and DF3 (lower) regions. The black data points represent observations from NIRSpec, while the coloured lines show model predictions with varying band gap energies. In each figure, the DISM model is shown in blue dashed line and the best models for the H II, atomic, and DF3 regions are shown in magenta, red, orange respectively.