Intensity ratio of the two components of the 7.7 μm PAH band versus the intensity of the UV radiation field G0. Again the data points for IC 63 and IC 59 are shown in the same colors as in the previous figures. The black points are taken from Stock & Peeters (2017). The dashed line corresponds to the fit to all black data points, while the solid line corresponds to the fit excluding the data points in the Ophiuchus diffuse cloud (Stock & Peeters 2017).
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