Continuum and silicate subtraction for the ¹²CO₂ bending mode in the 15 µm region. The left panel shows the fitting of the continuum (purple line). The middle panel shows the two Gaussian profiles (red and pink lines) and the combined final fit (orange line), which simulates the silicate absorption feature at 18 µm. The third panel shows the subtracted spectra after the silicate band was removed. The continuum subtraction for the remaining sources can be found in Appendix B.2.2.