Comparison of the nuclear spectrum of NGC 5728 (narrow emission lines and PAH features have been removed; red solid line) and the best-fit torus model (dashed green line) in the 5–25 μm region. The blue arrows correspond to the absoption bands of the H₂O bending mode (∼6–8 μm) and libration (∼11–16 μm) mode. The brown lines represent the 9.7 and 18.0 μm silicate features. The green arrows correspond to the absorption bands of C–H at 6.85 and 7.25 μm.