Comparison between the 6.2/11.3 PAH band ratio and the heating efficiency approximated by the ([C II] 157 + [O I] 63)/IFIR ratio. The data points for IC 63 and IC 59 are shown in the same colors as in the previous figures. The data points for the northwestern PDR of NGC 7023 (Boersma et al. 2014; Bernard-Salas et al. 2015) and the north PDR of NGC 2023 (Stock et al. 2015; Peeters et al. 2017) are shown in black for comparison.
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