Fig. 2.
Spitzer astronomical data observed for the Tc 1 and SMP SMC 16 (García-Hernández et al. 2010) and SMP SMC 24 (García-Hernández et al. 2011a) planetary nebulae (black curves) and IR spectra calculated for the cages, PPAs, pretzels, and branched structures families (red, green, purple, and blue curves, respectively). The four vertical lines mark the IR active lines of buckminsterfullerene (Krätschmer et al. 1990)
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