Fig. 14
Adapted from O’Dowd et al. (2009): L11.3 μm/L7.7 μm as a function of L6.2 μm/L7.7 μm. The symbols are the same as in Fig. 13. The black lines represent the expected ratios for fully neutral or fully ionized PAH molecules of a given number of carbon atoms from the models of Draine & Li (2001).
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