Left: Normalized 11.2 µm profiles illustrating the spectral diversity. Middle: The normalized profile for the primary component representative of the narrowest 11.2 µm profiles emergent in the atomic PDR (belonging to class A_11.2), the “transitional profile” of the broadest 11.2 µm profiles in DF 3 (belonging to class B_11.2) and the profile of the secondary component used in the 11.2 µm AIB decomposition. Right: Linear combination fitting for the 11.2 µm profile of a spaxel from beyond DF 3. The weighted component 1 and component 2 profiles are the primary (11.207 µm) and secondary (11.25 µm) subcomponents.