Fig. 2
5–20.5μm spectra for objects showing the 16–18 μm emission feature (solid lines). These spectra are normalised to the flux density at 18 μm. The names of objects are shown above the spectra. The spectrum of PN K3-60 was partially obtained using low (SL) and high-resolution (SH/LH) modes. The region containing this feature is shown by the dashed vertical lines.
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