Fig. 2
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Statistical analysis of IR spectra for 3465 PAHs in neutral (black), cationic (red), and anionic (blue) states. (a) Mean spectra from 2.5 to 15 μm. Shaded regions highlight key AIBs. (b)–(g) Close-ups of major bands with peak positions marked. (h)-(m) Peak position vs. carbon atom count (NC). Points show binned averages, and error bars are standard deviations.
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