Fig. 5.
Histograms showing the occurrence of PAHs with irregularity parameter ξ in the NASA Ames PAH database. Top panel: occurrence of PAHs of a certain irregularity parameter considering only small PAHs (defined as NC ≤ 34), while the bottom panel shows that for large PAHs (with NC > 34). The irregularity parameter is defined in Eq. (1).
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